Hi Bob,

Here's my take on it...

If two mics are used to record a single instrument, then the sound would need stereo playback to re-create the input from two mics since each mic will pick up up different sound characteristics.

Instruments such as organ and electric/electronic pianos usually have stereo output. This better reproduces the spread of sound that is emitted from these instruments. For example, on a piano the bass notes are heard to the left of the pianist while the treble notes are heard to the right.

If an instrument only uses a single mic for recording, then it is mono because there is only one signal. Even if this single input is recorded in stereo, it's not true stereo because both channels will be identical.

Regards,
Noel




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