Problem: Mark V35 Switching w/EM Customs MIDI Box

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itsthedon86
Bottle Rocket
Posts: 2
Joined: Fri Jul 16, 2021 3:36 pm

Problem: Mark V35 Switching w/EM Customs MIDI Box

Post by itsthedon86 » Fri Jul 16, 2021 3:45 pm

Hi all,

New here, but not new to the Mark V:35. I picked up a MIDI switcher interface from a Polish company called EM Custom (https://emcustom.eu/amp-midi-switcher-interface.html) after seeing videos where channel switching, EQ on/off and solo boost on/off worked seamlessly.

I received the box today and immediately had issues.

My MIDI controller (Morningstar MC-8) and the EM Customs MIDI box work fine together. A MIDI signal gets sent from the MC-8 to the MIDI box, and from the MIDI box to the amp's footswitch jack. That all works. However, the pop between channels and functions makes the amp damn near unusable. (yes, I know the channel pop is a thing. I've had two MV35's, a full-size MKV, a Rectoverb, a Dual Rec, but this is ten times louder).

Troubleshooting steps I've taken: replace V6 phase inverter tubes, switch MIDI cables, move MIDI controller to isolated power supply, etc. - no luck. I've also contacted EM Customs (great guys to deal with) and they're as stumped as I am.

Any thoughts?

rarebitusa
Mark II
Posts: 75
Joined: Mon Oct 08, 2018 10:15 am

Re: Problem: Mark V35 Switching w/EM Customs MIDI Box

Post by rarebitusa » Tue Jul 20, 2021 11:19 am

So does the pop occur, at the same level with an alternate switching mechanism ie: footswitch?

itsthedon86
Bottle Rocket
Posts: 2
Joined: Fri Jul 16, 2021 3:36 pm

Re: Problem: Mark V35 Switching w/EM Customs MIDI Box

Post by itsthedon86 » Wed Jul 21, 2021 6:46 pm

It does not. It's significantly louder. I've since returned the MIDI box and am looking for an alternate solution.

rarebitusa
Mark II
Posts: 75
Joined: Mon Oct 08, 2018 10:15 am

Re: Problem: Mark V35 Switching w/EM Customs MIDI Box

Post by rarebitusa » Wed Jul 21, 2021 8:37 pm

itsthedon86 wrote:
Wed Jul 21, 2021 6:46 pm
It does not. It's significantly louder. I've since returned the MIDI box and am looking for an alternate solution.
kinda water under the bridge now :) but the speculative thoughts were the I/O signals it was sending was probably in an unexpected order or with a timing pattern that didn't allow for proper relay settling. Would venture to guess a Mesa Matrix wouldn't have the same type of issues.

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