Continued from yesterday’s article.  Here are the switches I compared.

Mechanical Push Switch (Tactile)

You hear click noises.
[audio:https://gaje.jp/blog/wp-content/uploads/2011/12/tactile.mp3|titles=tactile]

Relay

There are occasional pop noises.
[audio:https://gaje.jp/blog/wp-content/uploads/2011/12/relay.mp3|titles=relay]

Analog Switch

Not bad but click noise intermittently happens.
[audio:https://gaje.jp/blog/wp-content/uploads/2011/12/tactile.mp3|titles=analog_sw_chat_cancel]

JFET Switch

 The most stable so far.
[audio:https://gaje.jp/blog/wp-content/uploads/2011/12/JFET.mp3|titles=JFET]

Other switches:

Attenuator  type.  Hard to eliminate leaks and pop noises.

Bipolar transistor switch.  Sound is not bad but DC drain due to base current is unavoidable.

KORG MS10/20 VCA type.  Not tested.