Thanks for that clip. It definitely is not a ground loop issue.
It sounds like its clipping somewhere in the chain. ALSO there is an od modulation in the first 1/2 of the video.
Is that from the pedal?

Soory I think it needs to be serviced. Please contact service at:

info@ehx.com m-f 9-5pm nyc time

No that should not do that. It Sounds like a digital ground loop.
Please try the pedal with the EHX supply and just the Mel9 away from other pedals to narrow it down.

ALSO your amp should be set clean.

It sounds like there is an impedance mismatch between units.
I am not familiar with your other units.
Please contact service Monday at:
info@ehx.com

See if anything here helps:

USING INFINITE REVERB
1. Decide which footswitch to use for controlling this feature. You can use either the internal footswitch or an external footswitch connected to the INFINITE jack. Plugging in an external footswitch, however, always disables the internal footswitch’s infinite reverb functionality.
2. If using the internal footswitch, ensure that the internal “TAILS” switch is ON; infinite reverb is inaccessible when this switch is OFF. If using the external footswitch, however, infinite reverb can be engaged regardless of whether TAILS is on or off.
3. Press and hold down the footswitch for more than 350 milliseconds. The LED will quickly cycle green, red, then orange to indicate that infinite reverb is engaged.
4. To exit infinite reverb, release the footswitch. The pedal will return to the state it was in before engaging infinite reverb.

USING OTHER CONTROLS WITH INFINITE REVERB
1. The FX LVL and Reverb Type knobs always function normally when Infinite Reverb is engaged.
2. When using the TIME or TONE knob to sculpt the fresh reverb sound, the infinite reverb’s time and tone that was set by those knobs before engaging infinite reverb are preserved.
3. As long as infinite reverb is accessible, it can be engaged regardless of whether the OCEANS 11 is in Secondary Knob Mode.
4. When entering infinite reverb, the OCEANS 11 preserves its TIME and TONE knob values. If the overriding TIME and TONE knobs are moved while infinite reverb is engaged, and infinite reverb is then disengaged, the original TIME and TONE knob values will be recalled unless they are moved again.
5. After disengaging infinite reverb, the fresh reverb will continue to play according to the decay rate and tone specified by the overriding TIME and TONE knob values. Additionally, these values are preserved for the next time infinite reverb is engaged. Changing reverb types or bypassing the pedal won’t reset the preserved TIME and TONE values. Power-cycling the OCEANS 11, however, will.

You can disable/enable the internal footswitch’s infinite reverb functionality. To do so, unplug power from the OCEANS 11, press and hold the footswitch, then plug power back in while holding the footswitch (this will also disable/enable the internal footswitch’s tap tempo control, see “Footswitch Functionality” on page 7). The LED will slowly blink five times if infinite reverb is turned off or will blink twice if infinite reverb is turned on. The OCEANS 11 saves your infinite reverb enable/disable setting until it is changed again, even if the pedal is removed from power.

You can also reset the internal footswitch’s infinite reverb functionality to the factory default setting of enabled by holding the footswitch when resetting secondary knob settings. See step 3 in “Erasing Secondary Knob Settings” on page 11.

Please write the techs at

info@ehx.com

9.6 volts is what a fresh 9 volt battery puts out with out a load on it.
SO 9 volts is just fine.
Maybe someone here can help with third party supplies that have isolated outputs.
Non isolated outputs will often create noise in pedals.