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it's something I know I'd like, at least. I hear pitchslide arpeggios in Capsule and YMCK songs sometimes and it's neat. could possibly work using the hardware sweeps, since those are logarithmic?
The hardware sweeps would reset every time you load the next note in the arp, so the chord wouldn't slide, it would just be short slides starting on the individual notes.
As cak said, there's a technical issue there (you can't slide all the pitches in the arp at the same rate in a linear pitch system, so the chord would warp). Switching to a log pitch system would allow it, but it's also a tradeoff that gives up one of the really cool things about Famitracker, which is its very transparent relationship to the hardware.
The only current workaround is to go with speed 1, and manually do the slides with Pxx.
One thing that is planned is linear pitch slides and vibratos, using calculations like the hardware slides (but with higher precision). This would be easy to add and could be enabled/disabled with an option to maintain compatibility with old files.
But that won't help for controlling both pitch and arpeggio at the same time, then I assume a logarithmic pitch system is necessary where pitch slides and note lookups are both linear operations. I don't think this could be added easily though.