Hi! > The 'scaling factors' I was referring to were for the pitch. NTSC machines > play 3.8% higher than PAL machines, and a semitone is 5.9% increase in > pitch, so they would sound *horrible* together if uncorrected. The ADSR > values cannot be compensated of course, as the resolution of Bob Yannes's > lookup table is far too coarse, but there's a reason for that - the ear is > not nearly so sensitive to ADSR timing or even filter cutoff as it is to > oscillator pitch. I'm willing to bet that the routines will sound fine > with ADSR left as they are. I don't think the filter cutoff frequency is > derived from a clocked source, but rather a voltage-controlled filter with > an 11bit D/A convertor. Thus the cutoff frequency is not affected by bus > clock. I'd confirm on this. The SID card for the Plus/4 runs at the single clock of the Plus/4 (885Khz), I think it is a quite heavier difference than the diff between the PAL/NTSC C64. When unchanged, a C64 music plays almost one note lower on the thing :-(. With a proper modified frq table, it becomes correct. The filters are unaffected, that's for sure. The ADSR difference becomes sometimes significant, but I'd doubt if the same applied to the NTSC C64 (at least, because it's actually faster than the PAL C64, whereas the Plus/4 SID is slower). L. - This message was sent through the cbm-hackers mailing list. To unsubscribe: echo unsubscribe | mail email@example.com.
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