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Forums > C64 Composing > 6581 Filter Bug in JCH
2015-11-22 20:50
alwyz

Registered: Dec 2011
Posts: 31
6581 Filter Bug in JCH

Wondering if anyone has experience with controlling the filter bug in JCH when using a 6581. I've got a few instruments with lowpass and highpass filters that sound fine, and others i can't get to stop popping no matter what I do. I'm sure there's some relation to something else like adsr, but I haven't figured it out as of yet.

Does anyone else using JCH know how to squash this bug with the 6581? I'm specifically asking for 2 reasons:

1. JCH is what i use to compose
2. If anyone had solved this, it would have been JCH.

Thanks.
2015-11-22 21:05
Frantic

Registered: Mar 2003
Posts: 1626
ADSR isn't really related to filter. What you talk about as the "filter bug"... are you referring to the clicking noise that happens when you switch from one filter type to another? If so, I'm pretty much 100% sure there is nothing in JCH's player code that deals with that specifically, and I am not sure what that would be really. (Not like the ADSR bug that you can control to some extent.) It just sets the filter type that the user asks for. Nothing more fancy than that.
2015-11-22 21:59
alwyz

Registered: Dec 2011
Posts: 31
Thanks for that tip, one less thing to look into.

One observation which may be obvious but wasn't to me, was that the filter turning off after the instrument is ended and the next, non-filtered instrument begins also triggers a click/pop. That makes sense but wasn't something i looked into at first.

Hard Restart does help a little - at least it makes things more consistent.

One way I've found to minimize it is to use the same filter for all instruments in a pattern. Once the chosen filter is on, then it's no longer an issue until it's altered again, which can be masked with a kick drum on the 1 beat or whatever.
2015-11-22 22:13
Soren

Registered: Dec 2001
Posts: 547
In fact, when using the 6581 chips, you will have some unwanted clicks when switching between different filtertypes.
In some cases you can get rid of some of it..
The "trick" is simply to keep one filtertype active all the time and only switch other types on/off... What I am talking about here is combined filter types. However, it's something that usually requires a bit of experimenting. :)
If you switch from one sound with filtertype 1 and in same voice later use a nonfiltered (filtertype 0) instrument, then it will give some clicking/popping.
Alternatively you could get your hands on a c64 with a 8580 chip - It doesn't have that "problem" or atleast only very little of it.
2015-11-22 22:22
alwyz

Registered: Dec 2011
Posts: 31
Thanks, that clears it up for me.

I do have an 8580 machine, but I just love the classic dirty sound of the 6581.

Thanks again.
2015-11-23 05:01
Soren

Registered: Dec 2001
Posts: 547
I guess I also prefer the sound of the 6581.
8580 is the easy chip, if you ask me. :)
2015-11-23 09:35
chatGPZ

Registered: Dec 2001
Posts: 11088
you can also try to hide the pops by switching filter stuff at the first or second frame of any drum/percussive sound :)
2015-11-23 10:21
SIDWAVE
Account closed

Registered: Apr 2002
Posts: 2238
what soren and groepaz said..

and, so say you have this worktune and its clicking like madness, and youre tired of edit and trouble.

things are easy to create, so now do what you almost never do: delete the whole filter on those 2 sounds, that whole section of music, and remake it, do something else.

often, you find a new solution that youre happy with.

i dont know JCH.. in SDI its a matter of rewriting a measly 3 bytes..
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