Hello, looking for a help. I would like to use one footswitch in stomp mode to toggle channels on my Revv 100P.
I was thinking about using dummy volume block assigned to one footswitch to get LED visual feedback. But I have not found a way how to send one CC message when the block is turned on and different CC one when turned off.
For example, when changed from off to on, send CC 38 with value 127, when changed from on to off, send CC 40 with value 127.
Thank you for any ideas.
Even the “off” select value does not solve this. It is not enabled in the “min value” select. And in the max value it resets to 0 after clicking on “done” 
This limitation needs to be improved…
The midi in the QC is super limited. Maybe this is possible, but wouldn’t be surprised if you couldn’t really do this
Maybe I am spoiled from RJM controller I was using some time ago. But this is quite simple use case IMHO :-/
This can be achieved by allocating an expression pedal to the specific pedal, then triggering max value or minimum value of the expression pedal. It does mean only two expression pedals can be allocated.
Thanks, but I would like to avoid using external expression pedal.
I have a Revv G50 and the only way I see to do this is to use scenes exclusively on the QC. And for each of the 8 scenes send a midi message to channel switch to the desired channel. Midi thru has to be turned off.
Can’t use stomps though because if you switch to stomp mode. The buttons will still change channels on the amp.
You could do hybrid mode with access to four scenes (for you channel on amp) and have 4 stomps to add or remove.
This is an area where we could use some improvement by Neural. A lot of people are resorting to a separate midi controller to do some of the more heavy midi lifting.
Thanks. I have already some working preset using scenes. Hope QC midi implementation will be improved in future. One of my use cases for QC was to get rid of pedals and amp footswitch to save some space when “on the road”. So no external midi controller for me.
Also regarding Revv channel switching: are you getting any “audio dropout” when changing channels? For example, got two scenes , both sending CC to set to dist channel and turn off FX loop. First scene with octaver before amp, second just dry signal. Today I have noticed that I am getting short audio dropout when switching between these scenes. I think this is on amp side, some kind of processing the midi CCs, even there is nothing to do - amp stays in the same channel for both scenes. Any experience with this?
Hmm. Let me give it a shot and get back to you. I haven’t noticed that but I’ll check. I’ve only been sending one midi command for the amp channel but maybe when it gets multiple it drops out temporarily??? I’ll try adding the fx loop command
Does the audio drop if you switch the channel with the amp footswitch? Some amps do have a small gap when switching channels. I wonder if that’s how the amp itself is
I am not observing this with amp footswitch. Also tried to set just the channel change CC to footswitch. The dropout happens also when I already am on the amp channel and press the footswitch. I was just wondering if other Revv amps experience this as well. It feels like the amp receives the CC and it takes it like a half second to decide what to do with it. Strange thing is that I would expect no pop / dropout when there is nothings to be changed on the amp.
Someone else on here was having a strange delay with midi changes from their QC. They did find some sort of fix for it in the thread. Maybe this could help - Midi latency - #20 by DDguitars
Either that, or you should contact Revv support. This issue might be the head itself
Just to leave a message here in case somebody get here for an answer in future. I have tried to use PC messages to switch “presets” on the amp instead sending CC messages to control “buttons”. Feels like the dropout is not present in this case.
So at the end of the day it was a “limitation” of the amp and not of the QC. Good to know 
(nevertheless the QCs midi functionality has to be expanded)
