Remixing & Mashups Stem Separation & Audio Editing Techniques

Question 1

What is 'stem separation' in the context of remixing?

Accepted Answer

Isolating individual elements (vocals, drums, bass, etc.) from a mixed audio track

Answer

Combining multiple tracks into a single file

Answer

Converting audio files between formats

Answer

Adding effects to a full mix

Question 2

Which AI-powered open-source tool developed by Deezer's research team is widely used for free stem separation?

Accepted Answer

Spleeter

Answer

RipX

Answer

iZotope RX

Answer

LALAL.AI

Question 3

What are the four standard stems produced by a typical 4-stem separation model?

Accepted Answer

Vocals, drums, bass, other instruments

Answer

Kick, snare, hi-hat, cymbal

Answer

Melody, harmony, rhythm, texture

Answer

Lead, pad, arp, bass

Question 4

What is 'phase cancellation' in audio editing?

Accepted Answer

When two identical waveforms are combined with one inverted, causing them to cancel out

Answer

When two signals play simultaneously at double volume

Answer

When two identical signals are perfectly in phase and reinforce each other

Answer

When high frequencies are removed from a signal

Question 5

What does the 'mid-side' (M/S) technique allow a remixer to do when editing stems?

Accepted Answer

Separately process the center (mid) and stereo width (side) components of a signal

Answer

Add reverb equally to both channels

Answer

Merge left and right channels into mono

Answer

Equalize only the sub-bass frequencies

Question 6

Which audio file format is preferred for sharing stems between producers because it preserves full audio quality?

Accepted Answer

WAV

Answer

MP3

Answer

OGG

Answer

AAC

Question 7

What is the primary quality challenge when using AI-separated stems compared to official artist stems?

Accepted Answer

AI-separated stems often contain artifacts and bleed from other instruments

Answer

AI stems are always transposed to the wrong key

Answer

AI stems are always mono while official stems are stereo

Answer

AI stems cannot be imported into most DAWs