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Forums > C64 Composing > SDI filters is all over the place

2016-03-31 15:13

Psylicium

Registered: Dec 2014
Posts: 9

SDI filters is all over the place

Ok, so I'm starting to get the hang of SDI. but I have encountered a peculiar issue with the filters... I want to have a filtered sound in channel 1 only. Let's say I have the following setup:

F=Filteded, NF=Not Filtered
CH1: F | CH2: NF | CH3: NF
Channel 1 plays F inst. - OK
Channel 2 plays NF inst. - OK
Channel 3 plays nothing

CH1: NF | CH2: F | CH3: NF
Channel 1 plays NF inst. - OK
Channel 2 plays F inst. - OK
Channel 3 plays nothing

CH1: NF | CH2: NF | CH3: F
Channel 1 plays NF inst. - OK
Channel 2 plays NF inst. - OK
Channel 3 plays F inst. - OK

I have tried playing with the "force single channel" settings, and it works as it should when the filtered instrument is playing in channel 3. Am I missing something, or is it only possible to have the filter playing correctly if the main filtered instrument is in channel 3?

2016-03-31 17:18

spider-j

Registered: Oct 2004
Posts: 498

Never worked with SDI, but could it be that bit7 of $d418 is setup wrong in your filter program?

2016-03-31 21:22

Psylicium

Registered: Dec 2014
Posts: 9

Oh... I seem to have located the problem. I forgot to initiate the filter table with a line that defines cutoff, band and resonance, like

01: 80 00 1F 42
02: <filter sweeps or whatever starts here>

Instead, I just entered the band/resonance value directly to the instrument in the sound editor - and that seems to affect other instruments as well. But anywho, all channels play as they should now - and I obviously still have things to learn :)

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