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

Stem separation (source separation) extracts individual musical elements like vocals, drums, bass, and instruments from a fully mixed audio file so they can be used independently.

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

Spleeter is an open-source AI tool created by Deezer that can separate audio into 2, 4, or 5 stems and is freely available on GitHub.

Question 3

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

Accepted Answer

Vocals, drums, bass, other instruments

Answer

The standard 4-stem model separates a mix into vocals, drums, bass, and 'other' — covering guitars, keys, and all remaining instruments.

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

Phase cancellation occurs when two identical signals are combined with one phase-inverted (180° out of phase), causing them to cancel each other out and reduce or eliminate audio.

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

Mid-side processing splits a stereo signal into its center (mid) and stereo width (side) components, enabling independent processing of each — useful for isolating or cleaning up elements.

Remixing & Mashups Practice Test

Remixing & Mashups Practice Test

Remixing & Mashups Stem Separation & Audio Editing Techniques