Roland GO:MIXER PRO-X boss with all inactive inputs automatically

with all inactive inputs automatically feeding a buffered Tuner output

there's no simpler choice than the DP-24SD

2H1L (asymmetrical band pass made of a 12 dB high pass and a 6 dB low pass)

This circuit/kit has PCB space for a DC input jack for the wall wart so you don't have to splice the wall wart

can be used in parallel or serial

Roland GO:MIXER PRO-X boss with all inactive inputs automaticallyThe latest addition to Roland's GO: MIXER series is here in the GO: MIXER PRO X now with even more great features! This compact 9 channel audio line mixer is perfect for the musician or content creator on the go, with enough inputs to please even a small ensemble. The GO: MIXER PRO X pre mixes multiple sources of audio (guitar, keyboard, backing tracks, microphone, and more) down to a stereo track that's instantly exportable to your favorite streaming