(v00 10-04-22)
TO LOAD THIS PICO-8 CART, in immediate mode, type: load #glass_instrument
Giving full credit to @packbat and @jo560hs for the suggestion of unique instruments.
This instrument is submitted to @packbat's project, "midilib."
I found a match in standard Midi instruments, however this can be renamed and renumbered by the Midilib team.
This has also been updated, it now only takes one instrument to play, not two.
The instrument is located at SFX zero.
https://www.lexaloffle.com/bbs/?tid=49265
Here is me writing for the very first time, 4-channel music from the opening to a song I wrote for piano years ago, using an instrument I just now made for Pico-8 simply called, "Glass."
Additional: I noticed that there is sometimes soft clicking of this instrument when played ONLINE yet NO clicking at all when played offline. Something perhaps could be investigated regarding this.