XPMCK

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Tasklist

FS#8 - Genesis FM @MP

Attached to Project: XPMCK
Opened by Mr Super User (mic) - Monday, 14 February 2011, 03:00 GMT-7
Task Type Feature Request
Category Playback library
Status New
Assigned To No-one
Operating System All
Severity Low
Priority Normal
Reported Version R28
Due in Version Undecided
Due Date Undecided
Percent Complete 0%
Votes 0
Private No

Details

@MOD (hardware modulation) is good... but its not flexible enough to do deep vibratos (i tested all settings). @MP (software pitch modulation) would be very useful.
This task depends upon

Comment by Mr Super User (mic) - Monday, 14 February 2011, 03:00 GMT-7
The historical reasons were that the Z80 that controls the sound chips on the Genesis has very limited RAM, from which the entire sound driver executes, so the driver needs to be kept small. Another reason is how note frequencies are set on the YM2612. Instead of just a single frequency (or period) value, there are two separate parameters; one for the "block" (octave), and one for the note within that octave. So when doing frequency slides, the driver would have to calculate the correct octave based on how far the frequency has deviated from its original value.
Adding support for, at least, @EP seems like a good idea, though.

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