Could it be that the PC has timing issues, maybe ? That's no offense.
The PAS16 came out in 386/486 times when mainboards had the usual industry standard stuff still.
- Correctly working ISA OSC signal, -5v via PSU, no enhanced V86, no ACPI/APIC, just MS-DOS 5.x/6.x or DR-DOS 6.0 (no Win9x/DOS7).. 😉
That was when things like "snooping" the PC-Speaker audio via ISA still worked (PAS16 does that on old PCs or so I heard).
"Time, it seems, doesn't flow. For some it's fast, for some it's slow.
In what to one race is no time at all, another race can rise and fall..." - The Minstrel
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