Audio - http://www.kpodj.com/esi-maya44-usb-p-101360/?gclid=Cj0KEQjw_tOdBRDv9tuvl7eAtNEBEiQA9Qm5IkGba_MothjQESbrqMyD5JKmunJQmS5RBZ92baTf3n8aAptM8P8HAQ
MIDI - http://www.bestbuy.com/site/m-audio-m-track-usb-midi-audio-interface/8853059.p?id=1218918010956&skuId=8853059&st=midi&cp=1&lp=2
Our band monitors the click using the Behringer IEM system. Cheap but works perfect. I start and stop using the Behringer FP1010.
My ONLY issue has been that Ableton Live does not let you record program changes for an external device. So for a while I was using OSC on my iPad to input control changes that could be recorded and then sent back to the HD500 after being translated to program changes using a convertor box from MIDI Solutions. Recently I have used Ableton in the arrangement mode which lets me quickly create a 1 measure midi clip that can be assigned an extrernal program change, but only 1 per clip so a song my required 1-4 clips.
If there was an easy way to map CC to PC on the HD500 that might work as well. Not sure if that is even possible. I am responsible for music, audio, video, staging, and lighting at the church. Don't need another thing to learn!
Glad to know that someone from Line6 is reading and interested. Thanks!