I was mistaken - on a real Lynx, the screen goes black with green letters when it has finished printing, so you can read the text easily. Jynx and Pale don't seem to do this. BUT on my actual Lynx the screen flashes magenta as you type each key. Quite weird.
I recorded a "wav" of the Dungeon Adventure cassette - and converted it to Tape 5. This is only 6mb, and takes just 2:27 minutes to load, instead of 10 mins.
I also had to "invert" the signal, as well as making the speed change. I added space between the files, to give the Lynx enough time to process. The first two files are basic and machine code. The last 3 files are just data.
This has been tested a real Lynx (upgraded to 96k, but it should work on a 48k too - because that's all I had back in the 80's!).