Erratic expression pedal behaviour on the MC8 Pro

Morningstar Gear MC Pro Series MIDI Controller
1

I just got this unit, and got things up and running fine…besides expression pedals.

Is the MC8 Pro extremely picky with expression pedals? I’m not familiar with any other Morningstar controllers so I don’t know if this one differs from them.

I have a couple of Boss FV-500 pedals, using their expression output. I thought they were pretty normal functioning expression pedals…and they work fine and smoothly on everything else I’ve connected them to.

On the MC8 Pro the response is stepped and erratic. I’ve tried adjusting every parameter I could find to no avail (sensitivity, curve etc). No matter how I set things, there are sudden abrupt moves. The percentage indicator also indicates this. It may stand still for a while, then suddenly make a 5 percent jump.

Is there some hidden setting I’ve missed? Is my unit faulty? Do any of you get smooth response from your expression pedals on this unit?

2

Have you performed a calibration? Have you tried LOWERING the expression sensitivity? Sorry for the obvious questions…just need to rule out the obvious things first

3

We have a step by step video guide for connecting and calibrating expression pedals here that may be helpful:

4

Yes, I’ve calibrated, tried all sensitivity settings and linear and custom curves. The response is still jagged/stepped.

Unless my FV-500 is different from current specs, the Expression pot should be 10k…So that should be just about perfect, no?

5

This one is solved :+1: I posted a response in another thread so just a heads up here:

I had made some small custom TRS cables that swapped tip/ring as this was needed when I used the FV-500’s with a Rocktron All Access. Since they have worked fine for years since then with my other equipment, my memory probably got things mixed, thinking it was these pedals that needed it, but it was likely the Rocktron.

All good now!

6

Hi. I Understand that the solution was to use normal TRS cables ? Your problem was very similar than mine and I don’t find any solution…

8

Yes, regular TRS cable :guitar: