You can use any program for showing pixs and cli based mod player.
Example s:startup-sequence
run modplayer df0:mod.amiga - this will play mod in task
showgif df0:pix1.gif
showgif df0:pix2.gif...etc.
Also some show-pix progs have some argument to add, like delay
for use in slideshow.
On my A500 long time before, I created some slide-show disks,
with FastJpeg from aminet and one simply modplayer (I forgot name).
A hope this will help a little..