10. Sendo DJ com o Mixxx

O Mixxx foi projetado para ser fácil de aprender para DJs novos e experientes.

This part of the manual provides you with directions for using Mixxx’s features to create your own mixes.

10.1. Setting Your Levels Properly (Gain Staging)

A level meter in Mixxx with the gain set properly for the loudest part of a track

Setting your levels properly, also known as gain staging, is essential for getting the best sound quality out of the equipment you are using. At every link in your signal chain, from Mixxx’s channel gains to the power amplifier, the level should be well above the noise floor, but lower than the maximum level before the signal clips. The level meters should mostly be around the top of their green region. The level meter pictured to the left shows where Mixxx’s level meters should average at the loudest parts of tracks. The average level should not be in the yellow region. Use the yellow region to leave headroom, or available level above the average before the signal clips. The loudest parts of the music (the transients) should briefly go into the yellow region.

A waveform at a good level

A waveform at a good level. Note that the example waveforms in this section were made by adjusting the visual gain of the waveform display in Mixxx to illustrate the concepts. Adjusting the visual gain of the waveform display does not change the level of the audio.

A level meter in Mixxx indicating clipping. The gain should be turned down!

If a level meter is in its red region, the signal is clipping and the gain should be turned down. Some equipment doesn’t have a level meter and only has an LED that turns on when the signal clips. Clipping means that the peaks of the waveform are flattened because the equipment has reached the maximum level that it can amplify the signal to. This distorts sound in an unpleasant way and can damage equipment by driving it with more power than it is designed to handle. Increasing the gain past the point where clipping begins (further into the red on a meter) will distort the signal more. If you want to make the sound louder when every part of the signal chain is at its maximum without clipping, use more speakers or use speakers that are more sensitive and convert electrical energy into acoustic energy more efficiently.

A clipping waveform

A clipping waveform

A level meter in Mixxx with the gain set too low

On the other hand, the signal should not be too low. This is because every audio device generates a little noise at a level referred to as its noise floor. Additionally, analog signals pick up noise as they travel along wires. The signal measured by the meter on the left is relatively close to the noise floor. When a device is turned up, the noise floor does not go up; only the signal does. However, every time the signal is amplified by the gain of another piece of equipment, both the noise and the signal from previous devices in the signal chain are amplified. For example, if your sound card is turned down and you turn the gain up on your mixer to compensate, the signal-to-noise ratio (SNR) of the sound card output will be low and the mixer’s gain will amplify the signal and the noise from the sound card, plus the noise picked up along the wire. The end result will have more noise than if the output of the sound card was turned up before the signal reached the mixer and the mixer’s gain did not have to be turned up.

A waveform at too low of a level

A waveform that is too close to the noise floor


To adjust the output volume of a sound system while maintaining a high signal-to-noise ratio, the gain should be adjusted as close to the speakers as possible. Refer to the Gain Knob section for details.

10.2. Beatmatching e Mixagem

Beatmatching is the process of adjusting the playback rate of a track so that it matches the tempo of another track. Beatmatching also involves adjusting the phase of the beats in a track so that they are aligned with the beats in the other track. Matching the tempo and aligning the beats are the two things a DJ must do to beatmatch.

O Mixxx pode igualar o tempo e alinhar as batidas para você porém isso requer um valor detectado de BPM preciso e uma grade de batidas correta para ambas as faixas. Para ativar esta funcionalidade, clique no botão guilabel:SINCRONIZAR. Para igualar as batidas manualmente, o tempo das duas faixas tem que ser sincronizado ao ajustar os deslizantes de taxa de reprodução. Você pode ajustar a fase das batidas ao clicar com o lado direito e arrastar em ambos os mostradores de onda para acelerar ou desacelerar temporariamente a velocidade até que as batidas se alinhem. Os botões de pitchbend temporários também podem ser usados para ajustar momentaneamente a taxa de reprodução, permitindo que você “empurre” as batidas da faixa para frente ou para trás, para que elas sejam alinhadas com as da outra faixa. Veja o capítulo Controles de Sincronização e Pitch.

Duas faixas tiveram um beatmatching terminado quando os seus tempos ficarem iguais e suas batidas forem alinhadas. Um beatmatching “perfeito” é praticamente impossível - existe sempre uma diferença minúscula nas taxas de reprodução. Um DJ afiado vai manter as suas orelhas abertas para ouvir as batidas ficando fora do alinhamento. Existe o distinto som de “bumbo grave duplo” que é precedido por um bumbo perdendo força porque os dois bumbos ficam fora de fase. Quando isso acontece, as batidas podem ser realinhadas simplesmente pressionando em um dos botões de pitch bend temporários algumas vezes na direção apropriada.

10.3. Master Sync

Novo na versão 2.0.

Master Sync is an intelligent assistant that allows you to leave the beatmatching to Mixxx so you can focus on track selection, effects manipulation, looping, 4 deck mixing, and other advanced DJing techniques.

To activate Master Sync on a deck, push and hold (or click and hold) the SYNC button. You’ll know Master Sync is on because the sync button will remain lit. Changing the rate of any deck that has Sync lit will change the rates of all other decks that also have the Sync button lit. There is no need to set specific decks to be a master or followers. You can play, stop, eject, load, and queue any track with master sync and it won’t interrupt the playback of the other decks. However, changing the rate of a stopped deck will change the rate of playing decks.

Master Sync will also notice if one of your tracks is double the BPM of another track and match them correctly. So if you want to mix a 140 BPM drum & bass track with a 70 bpm dubstep track, Master Sync will make sure they are lined up properly.


Usually, Master Sync will only make sure the rate sliders are set correctly. If you also want to make sure your beats are perfectly in sync, turn on the QUANTIZE button. When activated, Quantize will ensure that the beats are perfectly lined up as well.

10.4. Mixagem Harmônica

Harmonic mixing is a technique to mix songs with matching melodies and harmonies. To learn more about harmonic mixing you might want to check out the mixshare site.

Mixxx has two features to help you with harmonic mixing. The first is a key lock. When it is active changing the speed of a track won’t affect the key. To enable key lock, click the key lock button in the Grade de Botões de Opções do Deck. The second is that Mixxx can automatically detect the key of a track and will display it in the library and the decks. The notation which is used to display a key can be changed in Key Detection Preferences.

10.5. Using Effects

Novo na versão 2.0.

Mixxx comes with a set of native effects.

10.5.1. Flanger

The Flanger is simple modulation effect, created by taking the input signal and mixing it with a delayed, pitch modulated copy of itself.


Controls the intensity of the effect.


Sets the value for the delay length.


Controls the speed of the effect.

10.5.2. BitCrusher

The BitCrusher is an effect that adds quantization noise to the signal by the reduction of the resolution or bandwidth of the samples.

Bit Depth

Adjusts the bit depth of the samples.


Adjusts the sample rate to which the signal is downsampled.

10.5.3. Filter

The filter changes the tone of the music by allowing only high or low frequencies to pass through.


Corner frequency ratio of the low pass filter.


Resonance of the filters, default = Flat top.


Corner frequency ratio of the high pass filter.

10.5.4. Reverb

This is a port of the GPL’ed CAPS Reverb plugin, which has the following description: This is based on some of the famous Stanford CCRMA reverbs (NRev, KipRev) all based on the Chowning/Moorer/Schroeder reverberators, which use networks of simple allpass and comb delay filters.


Higher bandwidth values cause more bright (high-frequency) tones to be included.


Higher damping values cause reverberations to die out more quickly.


This effect is not available in the Mac App Store version of Mixxx.

10.5.5. Echo

Simple Echo with pingpong


How much of the signal to send into the delay buffer.


Delay time in seconds.


Amount the echo fades each time it loops.


As the ping-pong amount increases, increasing amounts of the echoed signal is bounced between the left and right speakers.

10.6. Gravando sua Mixagem

With the integrated recording feature you can record your mix as an audio file and listen to it later, distribute it as a Podcast or burn it to CD. Mixxx records the master output - the audio you hear from the speakers including the microphone.

Biblioteca do Mixxx - Visualização das Gravações

Biblioteca do Mixxx - Visualização das Gravações

Mixxx can record your mix in various audio formats and quality settings. You can split your recordings, generate cue files, choose a custom recording directory and even set your own metadata. By default, Mixxx saves your recordings as lossless wav files to a Mixxx/Recordings sub-folder in the Mixxx music directory. Before you start recording, we recommend that you adjust the settings in Preferences ‣ Recording.

Se você clicar no ícone Gravações na barra lateral da biblioteca do Mixxx, a tabela de faixas na direita vai mostrar o conteúdo do seu diretório de gravação. Novas gravações são automaticamente salvas nesse diretório e também os arquivos CUE se você escolher criá-los nas suas preferências.


Recording your mixes and listening to them later to critique yourself is a great tool for improving your DJing skills. Sending your mixes to other DJs for feedback can also be helpful.

10.6.1. Grave a sua miaxgem no disco

Novo na versão 2.0: Displays the duration of the recording.

  • Clique no ícone Gravações na barra lateral para trocar para a visualização Gravações

  • Clique no botão Iniciar Gravação ou clique no menu no topo da janela da aplicação do Mixxx Opções ‣ Gravar Mixagem.

  • The display above the track table shows how much data has already been recorded, as well as the duration of the recording.

  • Faça a sua mixagem

  • Clique no botão Parar Gravação para parar a gravação quando a mixagem estiver terminada.


You can instantly play your recording as a track in Mixxx. Simply drag-and-drop the track to a deck.

10.7. Using Auto DJ For Automatic Mixing

Biblioteca do Mixxx - Visualização do Auto DJ

Biblioteca do Mixxx - Visualização do Auto DJ

Novo na versão 2.0: Add random tracks from Auto DJ track sources

O Auto DJ permite que você carregue automaticamente faixas da lista de reprodução do Auto DJ quando a faixa atual estiver quase acabando, e faz a transição para ela. Veja Auto DJ - Automatize a sua mixagem.

10.7.1. Carregando faixas no Auto DJ

Para tocar faixas automaticamente, elas primeiro tem que ser carregadas na lista de reprodução do Auto DJ. A lista de reprodução do Auto DJ é vazia por padrão.

Biblioteca do Mixxx - Adicionando uma lista de reprodução no Auto DJ

Biblioteca do Mixxx - Adicionando uma lista de reprodução no Auto DJ

Existem várias maneiras de carregar faixas na lista de reprodução do Auto DJ:

  • Selecione uma ou várias faixas da biblioteca, uma lista de reprodução normal ou caixa e arraste elas para o ícone do Auto DJ na esquerda.

  • Selecione uma lista de reprodução normal ou caixa, clique com o lado direito e selecione Adicionar ao Auto DJ do menu do mouse. Isso adiciona todas as faixas ao Auto DJ.

  • Enquanto você estiver na visualização do Auto DJ da biblioteca, arraste arquivos de gerenciadores de arquivos externos para o ícone do Auto DJ na barra lateral ou para a tabela de faixas do Auto DJ na direita.

10.7.2. Using Auto DJ crates

Instead of inserting the contents of the crates directly into the Auto DJ playlist, Auto DJ crates are associated crates that become a source of random track selections.

  • Add a crate to the Auto DJ track sources: Expand the Auto DJ item in the sidebar, and right-click on the Crates sub-item. Select one of the existing crates from the list. This makes the content of the crate available for random selection into the Auto DJ queue for automatic mixing. The name of the crate is now listed as sub-item below.

    If you do not have any crates available for selection in the list, go and create a crate first and add some tracks, see Crates - Organizing tracks into collections.

  • Manually add tracks from track sources to Auto DJ: Click the Auto DJ item in the sidebar and switch to the Auto DJ view of the library. Click the Add random button to add one track at the time from Auto DJ track sources to the bottom of the Auto DJ playlist.


    If you did not set any crates as an Auto DJ track source, clicking the Add Random button will add a randomly selected track from the whole library instead.

  • Automatically add tracks from track sources to Auto DJ: Mixxx can randomly add tracks to the Auto DJ playlist from track sources as soon as a specified minimum number of tracks remain. Select Preferences ‣ Auto DJ ‣ Enable random track addition to queue ‣ On. Set Minimum allowed tracks before addition to change the minimum number of tracks after which random tracks may be added.


    If you did not set any crates as an Auto DJ track source, tracks are selected from the whole library instead.

  • Remove a crate from the Auto DJ track sources: Expand the Auto DJ item in the sidebar, and right-click on one of the crates listed below the Crates sub-item. Select Remove Crate as Track Source to remove the crate from the Auto DJ track sources.

10.7.3. Tocando faixas no Auto DJ

Agora que você carregou faixas na lista de reprodução do Auto DJ, você pode ativar o Auto DJ assim:

  • Clique no ícone do Auto DJ na barra lateral para mudar para a visualização Auto DJ da biblioteca.

  • Clique no botão Ativar Auto DJ.

  • As primeiras faixas da sua lista serão carregadas nos decks e a reprodução começará.

  • O Mixxx vai continuar a mixar automaticamente até que a lista de reprodução do Auto DJ esteja vazia.

  • Clique no botão Desativar Auto DJ para parar a mixagem automática


You can add a track to the end of the Auto DJ playlist once it is played instead of removing it. Set Preferences ‣ Auto DJ ‣ Re-queue tracks after playback ‣ On.