Finally had a chance to revist this.
Im not looking to go the Digital Volume control route, I want to find a solution that can span across multiple applications, and that route is too limiting right now.
Ive een looking at using switched resistor ladders, since Ive realized most of the controls I want to simulate are logarithmic. Ive also realized that my initial idea was far too complex. Seems like a digitally controller resistor ladder will maximize components.
http://www.eijndhoven.net/jos/attenuator-calculator/index.htmlNow these usually use relays, but Im interested in simulating this with transistors. I was thinking of using NPN switching pairs to simulate the "on-on" relays. Thoughts? Im still looking for an IC transistor array with 8 transistors without diodes on the collector!
Thanks for all your help! And yes David, going to start simple :-)