Re: ShellPlay

[andrep@balboa.eng.uci.edu (Andre Prellwitz)]

In article <fmlinC56w55.6nw@netcom.com> fmlin@netcom.com (Frank M. Lin) writes:
>ShellPlay does indeed have the best sound quality.  It sounded messed up at
>first because I have AppleTalk IRQ set to off ( TWGS ).  With it on, it
>produce the best sounds.

The docs for shellplay (yes, somebody actually reads docs, though not _before_
using wares :) state that the program uses a "nifty" loop-mode algorithm to
produce sound rather than the (now) outdated swap-mode alg.  So, Tim and Ian,
why is it that sT and MZ need to use swap mode?  Perhaps now we can have more
buzz-free mod players.

>What does IRQ have to do with sounds?  SoniqTracker, ModZap, NoiseTracker
>all sounds with with IRQ off.  But with SynthLab, ShellPlay, IRQ must
>be on or else the samples won't play right.

I don't know for sure what you mean.  sT, MZ, and NT all use interrupts to
do certain things (either update DOC RAM or update music sequences and/or 
screen data).  It seems to me that ANY mod player would require IRQ to be on.

>-- 
>Frank M. Lin     | IMG, California, U.S.A
>fmlin@netcom.com | need the faq of comp.sys.apple2?  e-mail me...