hello again, chuckists - I'd like to alter signal flow in response to input from HID devices. In this small example, i want mouse down to result in reverb, and mouse up to result in dry signal. The problem is that the reverb persists after the first mouse down - i tried unchucking in the mouse up "else if" statement, but that didn't work... thanks, all, j ----code---- adc => dac; NRev rev; Hid hi; HidMsg msg; if( !hi.openMouse( 0 ) ) me.exit(); <<< "mouse '" + hi.name() + "' ready...", "" >>>; while( true ) { // wait on event hi => now; // loop over messages while( hi.recv( msg ) ) { if( msg.isButtonDown() ) { <<<"down">>>; adc => rev => dac; } else if( msg.isButtonUp() ) { <<<"up">>>; adc => dac; } } }