I've got another pesky question about the YM2151. I have played around a little with the parameters and I would like an opinion if the following is the correct/normal behavior of the chip.
DT1 (fine detuning) is a 3 bit value, i.e. there should be 8 levels of detuning. However, it seems there are only four, so the bottom 4 and the top 4 levels have the exact same effect. The most significant bit is ignored.
Moreover, the detuning is quite underwhelming. At max setting (which is 3 or 7 for me, doesn't matter), the phase difference between two operators is about 1 wave duration per 3 to 4 seconds. In other words, if two sine waves are added, and one of them is detuned with DT1=7, those two waves cancel each other out once per 3 to 4 seconds.
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kliepatsch
Hi Folks,
I've got another pesky question about the YM2151. I have played around a little with the parameters and I would like an opinion if the following is the correct/normal behavior of the chip.
DT1 (fine detuning) is a 3 bit value, i.e. there should be 8 levels of detuning. However, it seems there are only four, so the bottom 4 and the top 4 levels have the exact same effect. The most significant bit is ignored.
Moreover, the detuning is quite underwhelming. At max setting (which is 3 or 7 for me, doesn't matter), the phase difference between two operators is about 1 wave duration per 3 to 4 seconds. In other words, if two sine waves are added, and one of them is detuned with DT1=7, those two waves cancel each other out once per 3 to 4 seconds.
Edited by kliepatschLink to comment
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