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Forums > C64 Composing > 6581/8580
2020-06-27 00:59
rupy

Registered: Mar 2020
Posts: 45
6581/8580

Is there some good reason SID music is not released with both 6581/8580 versions? Most tunes are only released for 8580 and some sounds play to low on 6581. Is there some way to convert 8580 tracks to increase the volume of the sounds that are too low on the 6581?
 
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2020-07-01 22:44
Frantic

Registered: Mar 2003
Posts: 1661
Yes, using different lookup tables would go some way to make the same tune sound more similar across the chips. Only problem is that there is also a lot of variation between different 6581 chips for example.

Some of the variation can be seen here:
2020-07-02 01:08
McMeatLoaf

Registered: Jan 2005
Posts: 112
The red, Follin-style curve isn't even at the end of the range, zerozillion had a chip with CF ~1000 Hz at register value $0. 6581 filter curves be crazy.
2020-07-02 02:00
acrouzet

Registered: May 2020
Posts: 100
Quote: Yes, using different lookup tables would go some way to make the same tune sound more similar across the chips. Only problem is that there is also a lot of variation between different 6581 chips for example.

Some of the variation can be seen here:


Yeah, that's true. I remember hearing that Martin Galway said the player for Terra Cresta originally had an option in which you could adjust the filter according to your own SID, but it was never implemented into the game. I wonder why nobody else has done that since then (to my knowledge).
2020-07-02 09:27
Conrad

Registered: Nov 2006
Posts: 856
Quote:
Yeah, that's true. I remember hearing that Martin Galway said the player for Terra Cresta originally had an option in which you could adjust the filter according to your own SID, but it was never implemented into the game. I wonder why nobody else has done that since then (to my knowledge).


The menu screen of L.E.D Storm had this option from what I remember, whether it was documented in the manual or not.

L.E.D. Storm
2020-07-02 13:53
chatGPZ

Registered: Dec 2001
Posts: 11523
Beach Head II too
2020-07-02 20:17
Rastah Bar
Account closed

Registered: Oct 2012
Posts: 336
And the 1984 game "Havoc"
http://www.gb64.com/game.php?id=3436&d=18&h=0
2020-07-06 16:48
booker
Account closed

Registered: Jul 2003
Posts: 334
Quote: Is there some good reason SID music is not released with both 6581/8580 versions? Most tunes are only released for 8580 and some sounds play to low on 6581. Is there some way to convert 8580 tracks to increase the volume of the sounds that are too low on the 6581?

I guess there are these cards which take both SIDs and you get it to play the tune on both the same time. Just choose the output. Solved.
2020-07-30 11:59
rupy

Registered: Mar 2020
Posts: 45
Would it make sense to have two official csdb 6581/8580 categories or tags? So one can filter and search on them?
2020-07-30 16:03
booker
Account closed

Registered: Jul 2003
Posts: 334
Quote: Would it make sense to have two official csdb 6581/8580 categories or tags? So one can filter and search on them?

maybe no need for tags, since tunes got that in PSID info.
2020-07-30 16:11
rupy

Registered: Mar 2020
Posts: 45
Aha, so csdb could automatically fetch that from hvsc and display it?

Edit: I just realized it is displayed on the sid page, but not the release even if it is a music release.
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