You can get 100 (instead of 25) sounds from the SA-8 - in other words, there are 75 hidden sounds in the SA-8
see
http://www.casperelectronics.com/finished-pieces/casio-sa-keyboards/-- see Comment 9 from PHOBoS
I have tried this it works.
However unless you have a compelling reason to have the sound numbers the same as the SA-1, I would suggest that you do NOT renumber the existing tone buttons as PHOBoS advises. Instead re-order the SA-1 sound list to match the button labelling system.
Thus:
Tone 1 button stays as tone 1
Tone 2 button stays as tone 2
Tone 3 button stays as tone 3
Tone 4 button stays as tone 4
Tone 5 button stays as tone 5
New buttons:
Tone 6 is a push-to-make button connecting pins 26 and 15 on the OKI
Tone 7 is a push-to-make button connecting pins 25 and 11 on the OKI
Tone 8 is a push-to-make button connecting pins 25 and 13 on the OKI
Tone 9 is a push-to-make button connecting pins 25 and 14 on the OKI
Tone 0 is a push-to-make button connecting pins 25 and 15 on the OKI
Now the two digit tone numbers 11,12,13,14,15... upto 55 are unchanged from the descriptions on the original front panel, but the new buttons allow access to the additional sounds.
The sounds using this number scheme are :-