Adding 3rds and 5ths During A Song

You guys have been very helpful for this (old) guy. I’m trying to construct a song in GP and have a question. I have a Moog solo that starts with 1 instrument, then on the second set of measures, it doubles with a third, and then on the third set of measures it triples with a fifth. Is there a way through GP where I can play the solo notes, then add a second Moog that’s up a third, and then add the fifth? Idea being that I’d play the same solo notes all 3 times, but the addition of the extra synths would add that third and fifth. Song is Boz Scaggs’ “Lido Shuffle” and it’s that signature solo. Thanks for any tips!

https://youtu.be/HQZBaJAngH8?t=166

So many ways — if your Moog is polyphonic (I know!) easiest is probably to just create a two more Midi In Blocks and transpose them by 3rd and 5th respectively, connect them all to your Moog and use Bypass to turn them on/off as needed.
If your Moog is monophonic, then just create multiple Moog plugins, one for each Midi In Block

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I’d go with David’s suggestion for a simple third or fifth. If you need anything more complex try to get your hands on the midiChords plugin by Insert Piz Here. It allows you to set up a different trigger for every key. I use this extensively to trigger full pads arrangements while I play piano parts. https://www.kvraudio.com/product/midichords-by-insert-piz-here
I think they stopped supporting it but I’ve found it to be reliable for the past five years.

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Another option is the midiForceToKey plugin, also from Piz MIDI (https://www.paulcecchettimusic.com/piz-midi-utilities-archived-download-links/). I am familiar with the Lido Shuffle synth solo and it employs both major and minor thirds in the arpeggio. This plugin will allow you to specify a root key that the interval you specify (thirds, fifths, etc.) must adhere to, and it will adjust the interval accordingly in real time. I used this plugin to master the flute and xylo solo in Toto’s Africa. Worked perfectly!

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Thanks everyone! I appreciate the knowledge.