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The only way that I know to play this part correctly is to change the Diatonic effect "key" several times during the song; that is, change the "key" as the song moves through the I, V, II, etc. changes … What is the best way to change the "key" in real time?
In my opinion, MIDI. If it's only 2 keys + 2 scales, you might get away with using Aux switches. While I always have expression pedal programming on all of my presets, I personally wouldn't use that to change Diatonic scales.
For an explanation of how I change Diatonic key & scale over MIDI, click here.
