[sdiy] audio control of momentary sw

[Adam Inglis]

What's a neat simple way of interfacing an audio signal to close a  
momentary switch?

The scenario is: I'm wanting a dedicated track of audio pulses on my  
DAW to replicate the front panel momentary switch on an old Casiotone  
keyboard. The switch closes a matrixed line (5 volt signal) that is  
polled by the CPU ("pattern stop - start").

I'm thinking an op-amp to a CMOS bilateral switch. Any one-chip  
solutions?



regards
Adam Inglis
http://www.adambaby.com