Proof of concept.

This is mostly a note for myself, just so that I won’t forget what I did here.  There are still many more questions out of this than there are answers, but this was truly an interesting experiment.

Components

  • Strat guitar, tuned C2-G2-D3-A3-E4-G4, strung with flatwounds
  • Behringer UMC404 audio interface
  • MacBook Air laptop, running Tracktion 7 DAW
  • Morley ABY pedal
  • Boss ME-70 multi effects pedal, running “clean” amp at about half gain and 3/4 preamp output;  master out for unit set at about half
  • IK iRig 2, set at max HW input gain and set “thru” for amp out
  • iPhone SE, running AmpliTube with a high-gain amp model

Signal path

  • Strat direct into input 1 of the 404, instrument level with 20dB pad engaged, gain about halfway up.
  • Hardware insert set up on input 1.  Send signal went into iRig guitar input.
  • iRig amp out (set to thru) went into ABY pedal to be split.
  • “A” leg of split went to the insert return.
  • “B” leg of split went to ME-70 unit.
  • Output of iRig went to channel 2 in the 404, set as Line level without pad, gain halfway up.
  • Stereo output of ME-70 went to channels 3 and 4 in the 404, set Line level without pad, gain halfway up.

DAW settings

  • Channel 3/4 treated as stereo pair.
  • Levels tuned to slightly favor clean signal by 1-2 dB.
  • Levels brought to peaking at between -10 and -5 dB.
  • Saturation and reverb plugins used on “direct” guitar signal.
  • Channels 2-4 used no processing or plugins.

Observations

  • Took a while to get input levels matched.  Still need to understand this audio interface better, and the exact difference between the “input” and “playback” sources on the “Mix” dial.  Also, it seems that using the hardware insert may cause the input level meter in the DAW not to report input levels.
  • Interesting that the 404 could, conceivably, be used as a hardware-only interface here.  The way this was set up, the mix was available entirely at the “inputs” end of the “Mix” dial;  in this case you’re using the preamps, line/instrument level and pad selectors, and the channel inserts are like a serial effects loop.  May want to look further into how to use the assignable and main outs with this in mind.
  • This wound up being, then, a single signal from the Strat, split into 4 channels:  1) dry signal, 2) wet signal from AmpliTube, 3/4) wet signal from ME-70, all in parallel.
  • The idea of “tricking” Channel 1 with the hardware insert seemed to work well.  Signal degradation from the send to and return from AmpliTube was frankly better than I’d expected.
  • The Mac must cause some sort of ground loop, as there is definite noise added when the power adapter is connected.
  • I like this idea of the parallel signals.  In this case it was interesting to hear the initial signal with the high-gain amp sound, but then the delay repeats coming from the ME-70 were clean, not dirty.  Likewise, having a clean signal in parallel with the dirty one definitely helps note clarity.  It will be worth doing more work on this.

 

A successful experiment.  Now, to figure out what I want to do with this idea.  🙂

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Published by

Kevin Wilmeth

Professional geek. Amateur human. Credible threat to musical instruments anywhere. (I can't help it. Ideas just invade my brain...)

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