Whenever I listen to most SPC files in a 7-Zip file the app will crash whenever it goes into the background after about a second or two. I'm pretty sure it's because of the 7-Zip archive, because I've never had problems with .rsn files before. It plays fine when the app's in the foreground.
Here is the console log when it crashes.
Feb 9 23:34:14 unknown UIKitApplication:com.yoyofr.modizer[0xc8be][3058] <Notice>: modizer(3058,0x3e8bfce8) malloc: *** error for object 0xaf05c40: double free
Feb 9 23:34:14 unknown UIKitApplication:com.yoyofr.modizer[0xc8be][3058] <Notice>: *** set a breakpoint in malloc_error_break to debug
Here is the crash report for it.
modizer_2012-02-09-233414_Christophers-iPhone.crashI can provide a file that causes it to crash if you need it.