Hello,
I took my v256 for a test drive last night. I was using it in my basement for low volume rehearsals & it worked fine. I took it to an open mic last night & when using it in instrument control mode it just screamed when I activated it. I ran my bass & the mic into the input side then the xlr out to the sound guy & the instrument out to my pedal board which then went to my amp. I worked fine when I ran it in Vox-Robo mode & took my bass out of the signal chain but it did not sound good at all. I need this bad-boy to work in instrument mode in loud live setting or it is no good to me. Any advice?

Thanks!!