Meris Polymoon “crash” sound

Morningstar Gear ML5
1

I have a Meris Polymoon pedal on its own ML5 loop.
When I first fire up my pedalboard, the Polymoon is on - but the ML5 loop is bypassed.
When I send a PC message to the ML5 to turn on the loop, the Polymoon creates a very loud “crashing” sound through my amp.
Only on the first time.
After that the loop switching is quiet.
Is there a fix for this ?

2

Sounds like some sort of charge build up in the Polymoon. I suppose if you trigger the loop manually on the ML5, this will still happen?

3

James
Yes this happens when I engage the loop manually as well.

Is this a bypass problem? A grounding problem?
This didn’t happen when the Polymoon was in series with other pedals - only when connected to the ML5 discrete loop.

Does the ML5 have a buffered bypass option as well as a true bypass?

Can I put a delay on the the engaging process of the ML5 button?

I can ‘discharge’ the static charge build up by manually turning the ML5 loop on & off, a few times with the amps in “Standby” mode.
I use a wet/dry rig with two amps, both cable outputs are fully isolated and buffered with very good discrete products specially made for this purpose, and the rig is totally noise free, except for this one switching issue with the Polymoon.

Regards

Bob Watson

4

The ML5 is completely true bypass and does not have a buffer. I think this issue would still occur if you put it in a regular 3PDT bypass looper. I don’t have the Polymoon but only the Mecury7, Hedra and Enzo. I can give it a try tomorrow and see if I can replicate the issue.

Not sure if it will help to solder in a pull-down resistor to the input/output.

The ML5 has a muted switching option which you can apply to just a specific loop: https://morningstarengineering.atlassian.net/wiki/spaces/ML5/pages/491730/ML5+User+Manual#Muted-Switching

You can just try applying it to the Polymoon Loop, so whenever that loop switches, the output will be muted.

5

Thanks James
I’ll try the muted output fix.

Regards

Bob Watson

6

James
Tried the ML5 Muting option on loop A - still no change.
Meris support also involved - I might try buffered / Layer bypass option on the Polymoon to see if it changes the issue.

Not very hopeful though….

Regards

Bob Watson

7

I tested with the Enzo and didn’t have any issues - might be just related to the Polymoon. The ML5 relays are just wired like any 3PDT switch (except its a relay) so I’m not sure what else can be done there.

8

Thanks James
I have been asked by Meris support to try “Relay Bypass” instead of “Buffered bypass”.
The Polymoon is also currently set to “Instrument Level” - I’m going to try “Line Level” instead.

Regards

Bob Watson

9

James
I have tried everything that Meris support suggests - to no avail.
I have delayed the engagement of Loop A to the max value - this doesn’t seem to affect the issue at all.
The Polymoon does scan the controls at startup - and it seems to trigger some sort of trail which causes the noise - but I have Trails and Glide turned off……

Regards

Bob Watson