Mute (kill-switches) 6 CH i/o

Hi, I am going to create a simple mute or to be precise, kill switch for 6 channels mono inputs-outputs (perhaps we can do stereo version in the future!). Here I added six LEDs to indicate closed circuit (un-mute) switch (ON) using NPN transistor (2N23904 or equivalent) for each channels. This module is inspired from the VCV Rack mute module.

Schematic:

Note: Resistor is between 1K – 680 Ohms, depending on the LED size (3mm or 5mm), which will forward 0.7-0.8 Vbs (Base to Emitter-ground).