We've got stripes! All of them now!
I actually replicate the pattern until the border is filled vertically.
Tape loading still doesn't work well for 128k games, which in turn prevents me from hearing much music, which prevents me from improving AY-3-8912 audio playback. I will probably resort to transcribing some music to PLAY commands myself, and trying the old synthesis commands. I can work the fine detail of tape loading at a later time.