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In my band we sometimes invite guest players. It's nice to be able to connect the instrument of the player quickly and just play. The Axe-Fx can accomodate this: I have a preset especially for this purpose (dual guitars). Good to share.
One approach is to use the FXL block and use Input2 Left for the additional instrument. If FXL is not connected to Input on the grid it enables the signal from Input2 to enter the grid. But: using FXL disables Copy Out1 > Out2. I depend on Copy Out1 > Out2 to have separate FOH and monitor signals, so this is a no-go for me.
Luckily, there's an alternative: use two rows with isolated input routing.
Notes:
One approach is to use the FXL block and use Input2 Left for the additional instrument. If FXL is not connected to Input on the grid it enables the signal from Input2 to enter the grid. But: using FXL disables Copy Out1 > Out2. I depend on Copy Out1 > Out2 to have separate FOH and monitor signals, so this is a no-go for me.
Luckily, there's an alternative: use two rows with isolated input routing.
- Make sure that in I/O Input1 is set to Stereo.
- Connect the additional instrument to Input1 Right (rear).
- Use two separate rows. Start each one with an Amp. On their Advanced pages set Amp1 to use the left input (= front) and Amp2 to use the right input (= rear right).
- Add cab and post-amp effects (if there are many you need an Ultra).
Notes:
- You don't have to use Amp blocks if your tone doesn't require one (piezo). A Mixer in the first column of each row will work too.
- This approach also works for using an acoustic guitar/piezo (rear Input1 Right) and electric guitar (front) simultaneously, if your amp can handle the ac/piezo signal through Output1.
- In this scenario everything is summed at the output and goes through Output1. If you need separate output signals (Out1 / Out2), use the FXL-method and make sure it doesn't connect to Output on the grid.
- Setting Input1 to Stereo (default is Left) in I/O may impact other presets, because Amps are set to Sum L+R by default. Check your presets.
- Having two rows with amps and instruments may add some hiss to the signal.
- This method is nothing new but it deserves a little attention. ChrisAllen made a video: YouTube - Axe FX - 2 separate inputs using mixers
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