Schmalle

You can use snapshots for this. Toggle or step through snapshots in Stomp Mode by assigning a snapshot command to a footswitch in Command Center.

There is no unloading presets. You can load presets via MIDI PC messages and switch bypass A, B or A+B via MIDI CC messages. Read the Sunset's manual to find out more. You can of course create a preset on the Sunset where A and B are bypassed and load that preset to turn the Sunset "off".

What I proposed is an alternative way. The manual endorses ToggleEXP but that can lead to sync problems with snapshots. You need to set Global Settings -> Footswitches -> FS8 to FS8 Function (and not ToggleEXP) for this to work. The idea is that one block is on at a time while the other is off - FS8 (toe switch) toggles between them. EXP1 controls the Position of both blocks at all times but it is only heard in the block that is currently enabled/not bypassed.

Yes.

Post the lead preset if you want a diagnosis on why it crackles.

No. You need an extra volume block. And you need to use EXP1 for both the wah and vol block and toggle their bypass states with the toe switch.

If the footswitch has LED indicators (like the Catalyst's LFS2) and is passive (no batteries, no power) it will not work with the Stomp.

Make sure to engage USB MIDI in your Global Settings -> MIDI/Tempo: USB MIDI TxMIDI Clock if needed: MIDI PC Tx

Hi! A dedicated relay switcher will definitely work. I think Peavey uses common V+ instead of common ground. Is the channel getting switched (depending on the channel selected on the amp) when you connect both units with the TRS cable (Helix: External Amp <-> Peavey: Channel / Boost)? - If so you can build a modded TRS cable and get either the channel switching or the boost function Helix-switchable: you cut the tip or ring connection and swap the other two e.g. tip and sleeve.

The Marshall 2525 is weird in that the tone controls are after the fx loop.

The IR block in the patch that you use - what does the Level parameter read? Default is -18dB which with most IRs is about as loud as bypassed. IRs are captured frequency responses of mic'ed cabinets (at least that's what they are used for most often). Playing a mic'ed cab simulation into a cab doesn't make much sense in most cases. It can sound cool though. Generally: Play into a power amp without IRs but use a signal with IR for direct recordings or to feed FOH.

Das kann ich definitiv hören. Hast du einen weiteren IR-Loader als "dritte Meinung"? Könnte es sein, dass bei NadIR ein HighCut bei 20kHz an ist? Wenn du im Helix den HighCut im IR Block auf 20kHz (höchster Wert) stellst, dann sollte es ziemlich gleich klingen.

Das sieht gut aus, aber probier' mal Export mit 48kHz - das ist die Samplerate vom Helix. Nebenbei: Die Sache spielt sich bei 15kHz und drüber ab, ich könnte das nicht hören - und ich bezweifel stark, dass das den Sound dünn und fizzy macht.

The dry through should work for your return. When you get burried in a mix that can have multiple causes. This might help: listen to your amp from another angle use appropriate volume often making your sound more mid-focused helps try to find a complementary sound that works with the 2nd guitar

Look at the exported IRs in the time domain (amplitude over time graph instead of amplitude over frequency) and see if they need to be truncated. In other word: is there silence at the start of those IRs?

One data pin probably is not connected.

Using MIDI for controlling that amp is easy and described in the amp's manual. You don't even need to set it up on the Helix if you switch amp channels with presets. And with Snapshots the Command Center isn't hard to set up either. You / he can ask here if questions arise.

That amp can be switched with MIDI. No problem.

The Input block has a parameter called Gtr Pad. Set it to ON. Or set Gtr Pad to Global and Global Settings -> Ins/Outs -> Input Level to Line.

Sure, Controller Assign the expression pedal to the Level parameter in the Output Main L/R block.

The Fender Mid Boost Eric Clapton can boost the signal 25dB. That's WAY too much for the HX's input to handle. Definitely use the HX's Pad although it is only -7dB which isn't remotely enough to handle the full boost capabilities of the Clapton.

You could try this: engage the Feedbacker and save it as User Default (press and release both < and > PAGE buttons, then press Knob3). Otherwise contact support about this.

I don't have the HX One so I can't verify that. On my HX Stomp it can be saved engaged and does immediately feedback. You can contact support and ask whether saving it engaged is possible.

The feedbacker is made like this for a reason. It is supposed to feedback when you trigger it - not at preset load. But you can save the preset with the engaged feedbacker if you want to. The MIDI messages are correct. BUT the timing is suspicious: the CC messages are send one millisecond after the PC messages. The HX One is probably busy loading the preset in that moment and ignores / discards the CC message. So there are your two solutions: save the preset with the feedbacker engaged or add a small delay between the PC and the CC messages.

These are MIDI PC messages and we were talking about CC (or alternatively NoteOn) messages. You don't need to send Bank Select messages btw. HX One only has one bank and ignores them anyways.