Pre for Cayin's integrated?

I have the Cayin 100 and use the VAS Citation I preamp with it in bypass mode which makes it a power amp. Works great. In bypass mode the remote will not control volume, it must be done from the preamp. Cayin/VAS makes great products that produce great sound, and great value.

Do you have to jump the amp/preamp sections in the back or does the signal run through the preamp section at a fixed volume?

Might be a little to late to the party... but Pre-In is designed so that the volume control is done on the external device (pre-amp, A/V receiver like for home theater etc).