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!

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.