Schmalle

Well, the Q Filter is an option if you want to tweak. I used this block as my wah (Type: LoPass) until we got the Teardrop Bass Q. If you need a starting point I tried to approximate the UK Wah 846 and came up with these settings: Freq: controller assigned to the expression pedal with Min 45%, Max 85% Q: controller assigned to the expression pedal with Min 75%, Max 35% Gain: 10% Type: Bandpass Mix: 100% Level: +1 dB It's reasonably close but has less bass, so to get closer I'd have to add a bass boosting eq block.

Yes. Select the expression pedal (instead of a footswitch) in Bypass Assign for the Wah block (and other blocks if you like).

Deactivate Global Settings > MIDI/Tempo > MIDI PC Tx to prevent your Stomp from automatically sending MIDI PC (program change) messages when you change patches - because otherwise the sent program number is always the patch number. Instead use Command Center's Instant Command to send a BankPC command via MIDI.

This is possible and easy to do!

As a first attempt try the Tilt EQ as a first block to equalize between guitars. It can act as an amp like treble control to darken or brighten up the resonse of an amp. Start with Center=1 kHz, adjust Tilt, then fine tune Center and use Level to adjust the guitar output levels if needed.

Your example is basically a variant of the 4-Cable Method (see in the manual). Cabling: guitar -> HX In L pedal Out -> HX In R HX Out L -> amp input HX Out R -> pedal In The loop stays on when the effect is bypassed in this configuration and you can change the position pre or post per patch.

I can't open your attachments. You're probably encoutering phasing artifacts. If you mix in the FX loop signal partially this can happen, use Mix at 100%.

The Peavey switches channels using a relay. The relay is engaged when connected to a voltage. Peavey uses a negative supply voltage to do that. I don't own a Helix and haven't seen the circuit board but AFAIK Helix uses a transistor based open collector circuit to switch. I would be very surprised if this isn't done with an NPN transistor. Unfortunately to switch negative voltages you'd need a PNP transistor.

Helix's Ext Amp switching isn't compatible with the Peavey Delta Blues.

The ring contact is for switching the FX loop in your Marshall.

When you plug a TS jack (cable) in the Marshall's F/S socket: does this engage the Marshall's FX loop? If that is the case you need a TRS cable to connect Helix Ext Amp and Marshall F/S sockets. Use Command Center's Ext. Amp Command to do the channel switching. Program a footswitch if you want to be able to change channels while staying on a snapshot. Otherwise program an Instant Command per snapshot.

1 A is the rounded up figure of the measured maximal current draw of the device. Why Line 6 choose to print "3 A" on the HX Stomp - I don't know. But it is definitely not the actual technical current requirement.

The thing to do in those situations is trying to isolate the problem. Where in the 4CM signal chain does the problem occur is the question. The problem can be the amp, the cables, Helix hardware or the patch. Before you even pull out one cable disengage the FX loop block in Helix and listen if your dry guitar gets to the power amp. If it does engage the FX loop block again. Next step would be to disable the amp's FX loop and listen if signal gets through. With these two tests you can exclude a lot of problem causes. To exclude hardware problems in the FX loops (the amp's and Helix') connect send and return directly with a patch cable and test if signal gets through.

Sounds like you assigned the exp pedal to a parameter on a block. Have you tested multiple presets or created a new one from scratch to make sure it isn't that?

This is a user forum. Open a support ticket and ask customer support.