Pipe audio in or out of your project with this very handy panel mount audio jack. It's a mono jack with a disconnect pin so you'll get a ground sleeve
Chassis Mount 3.5mm Mono Jack, Normally Closed – We-Supply
35FM3 Switchcraft Inc., Connectors, Interconnects
1/8 (3.5mm) Mono Audio Jack (Panel Mount)
1/8 3.5Mm Mono TS Female Jack Socket with Switch Panel Mount (LW) (10 Pack)
3.5mm TRRS Jack Panel Mount Connector - Metal
3.5mm 1/8-inch TS socket for audio.
1/8 3.5mm Mono TS Female Jack Socket with Switch Panel Mount (10 Pack)
3.5mm Stereo Jack Open Panel
Jack Socket, 3.5mm, Mono, Panel Mount, with Switch, PJ-323M - DSMCZ
3.5mm Stereo Feed-Thru Jack, Chassis Mount – We-Supply