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Forums > C64 Composing > VICE 3.1 Filter Farting BUG!
2017-07-03 17:53
Groepaz

Registered: Dec 2001
Posts: 8144
VICE 3.1 Filter Farting BUG!

SOOOO!

leandro is asking for more examples of tunes that suffer from this problem - please tell :)

he also hinted that perhaps increasing the filter bias value to 3000 or more will remove it - please try doing this.

i will point him to this thread so i dont have to play the man in the middle....
2017-07-03 18:35
Jammer

Registered: Nov 2002
Posts: 638
Filter bias doesn't help much with fugly release/attack of sounds with low cutoff. Isn't the whole problem simple aliasing caused by lack of floating point calculations?
2017-07-03 19:20
algorithm

Registered: May 2002
Posts: 682
This is one example Title Needed

Less "oomph" in the bass and snares, even when adjusting filter bias. (Not the same as on my c64c or other emulators using 8580 (hoxs64, micro64, older versions of vice)
2017-07-03 19:30
Groepaz

Registered: Dec 2001
Posts: 8144
Quote:
Isn't the whole problem simple aliasing caused by lack of floating point calculations?

no. the filter stuff uses floats anyway iirc.

also please give actual examples and dont make this a speculation thread - that doesnt help at all. thx.
2017-07-03 20:35
spider-j

Registered: Oct 2004
Posts: 115
Just a single looping pattern. Bass farting in VICE 3.1 - not on real machine or previous VICE. Psid64 exe and GoatTracker "source" sng file included.
http://www.jansalleine.com/trans/fartbass.zip
Happy bughunt! ;-)

EDIT: oh, and setting BIAS to 3000 only fixes the crackling sound after instrument execution.
2017-07-04 07:27
JackAsser

Registered: Jun 2002
Posts: 1229
Quote: Quote:
Isn't the whole problem simple aliasing caused by lack of floating point calculations?

no. the filter stuff uses floats anyway iirc.

also please give actual examples and dont make this a speculation thread - that doesnt help at all. thx.


It's clearly the CIA-emulation that causes timing distortions which disrupts the filters.
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