Schmalle

Touching the Tap Tempo footswitch displays the current BPM - you can also edit the value there. Global Settings -> MIDI/Tempo -> BPM does the same.

Good. We go on with the empty patch where only an FX Loop L block (Send 0dB, Return 0dB, Mix 100%) is added: In Global Settings->Ins/Outs set Input Level, Output Level and Send/ReturnL to Inst and Return Type to Return. Crank HX's VOLUME knob to get unity gain. Now volume shouldn't be an issue and it should work.

O.K. so it's not your amp. Do this test: A) empty preset connect guitar -> HX In connect HX Out -> amp return You hear the guitar plugged into the power amp at this point. B) add FX Loop L block in the preset You don't hear the guitar anymore. C) connect HX Send -> HX Return L/Mono You hear the guitar plugged into the power amp again. D) disconnect HX Send -> HX Return L/Mono again connect HX Send -> amp input connect amp send -> HX Return L/Mono You should hear the amp now. Do you successfully get through the steps A...D?

Yes. HX is true bypassed when it's off so your guitar is basically plugged straight into the power amp / return. Confirm that your amp's send works correctly and that your cables are not defective.

I mean - it looks like a bug. The OS uses the wrong start value (100%) for volume. Opening up a support ticket is worth a try. Maybe it's a know issue. Why don't you lower the volume on the monitors themselves? Aren't they too loud anyways?

Let's make sure your amp works correctly: Connect only the guitar to your amp and play - you should hear sound. Connect a second cable from the amp's send to it's return - you should hear sound. Disconnect only the plug on the amp's send so that only one side of the cable is plugged into the return - you should NOT hear sound. If your amp passes this test it is not the issue. Make sure to test all cables, too.

See the manual p. 38: Setting Path B’s Output There may be situations where you want parallel Path B to be sent to a completely different set of outputs. 1. In the Signal Flow view, turn the Big Knob to select the point where the two paths merge. The Mixer block appears only when selected: 2. Touch Footswitch 2 and turn Knob 2 (Path B Output) to select “Send12.” The Mixer block splits into two, indicating Path A is being sent from the HX Effects hardware’s Main L/R outputs and Path B is being sent from its Send 1/2 outputs.

Yes. Use the View button to get to Play view if it's not active. Press the upper knob to navigate to the preset list. Press the middle "Snapshot" knob.

I read this as you use the Stomp as USB interface and the monitors are directly connected to the Outs. Is this correct?

Make sure Global Settings -> Ins/Outs -> 1/4" Outputs is set to Line if the problem is low output level.

To much level causes clipping. I guess you use the delays and the H90 after the an amp block?! Lower the amp block's Ch Vol parameter to increase the headroom for the blocks that come after it.

No. Did he ever share that preset? Anyways here is the video for reference: Bonus clip from his own YT channel:

From what I understand the Helix algorithms run at 48 kHz on the DSPs and while the USB interface offers other sample rates these are converted from / to 48 kHz. 96 kHz isn't making stuff faster or better - it's twice the amout of samples without a benefit is what I was trying to say. I might be wrong about this.

The method in the video is also valid and it saves you one block, because the Send block isn't needed. Different cabling though.

Helix is 48kHz. With 96kHz you basically record every sample twice via USB.