I learned along time ago that nobody wants to listen to a problem unless you have a solution. Unfortunately, I don't have the skill for a solution to this, you should ignore my whining.
Some additional troubleshooting info to pass along for this very poorly written bug report.
The CFFA slot also doesn't provide the expected results. I used CiderPress to create a 5MB ProDOS formatted .po file then CHDMAN to convert it:
$ chdman createhd -i "path_to\5MB ProDOS.po" -o "path_to\5MB ProDOS.chd"
Mounting it in the apple1:
$ mess64 -skip_gameinfo -w apple1 -exp cffa -hard "path_to\5MB ProDOS.chd"
Typing 9000R should display 9000: 4C and then the menu, but it only displays 9000: CD, so I think the a1bus may be the culprit rather than me (but I wouldn't wager any money on my MESS user skills)
One final piece of info. I was hoping to understand this because I wanted to try and add sound to the apple1 by connecting the apple1 cassette output to the dac speaker by using the info from http://www.applefritter.com/book/export/html/2878
But after studying the code and trying (all day long) it is just too difficult for a beginner like me.