hey there ! i've also been using the snesAMP for spc files on my computer for a while and i must say it's a great plugin ! however you are using some old code there :D
may i recommend the following site:
http://www.alpha-ii.com/Download/Main.html#SNESAmp
there you will find the 3.1 version of snesAMP (which is a major improvement compared to what ? v2.10 ? holy cow !
http://snesmusic.org/spcsets/ for all your classic OSTs :D
enjoy :d
as for support for bsplayer.... i'm using bsplayer for video files only as there seems to be some problems with OGG files and winamp playlist editor in 5.0 ans up is fully customizable (font and font size makes for a more efficient playlist than bsplayer (sizewise....because bsplayer royally kicks winamp ass in pretty much everything else....)
i just wish the two of them merged :d (drools)