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Rub_0201
Registered: Apr 2019
Posts: 18 |
How to mute the voices of the SID?
Hi!
I want to remix my favorite SID tunes. A lot of them have nice rhythm, ideas and melody, but if I hear them more then 10 times in a loop, I get dizzy.
I want to bring more stillness and a different temper in them - making a remix.
My idea is to mute one or two of the voices of the SID and additionally fiddle around with some registers.
I did that with emulators like the C64debugger("24Hours Demo Remix" on YT) and the result is quite nice. Now I want to do it on the C64 itself.
As I am no SID programmer or musician, I have no clue how to do it on the real machine.
I understand fundamental assembly coding, but I am far from doing fancy stuff.
So I need your help! |
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spider-j
Registered: Oct 2004
Posts: 498 |
Quoting chatGPZof the different manufacturing process (there is no "fix" for this in the 8580) :)
Well at least the manufactoring process seems to have been optimized (?) in a way that you get comparable results between chips – I'd also let this count as kind of a "fix" :-) |
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Bansai
Registered: Feb 2023
Posts: 49 |
Quote: Clicks and snaps are part of SID music :) You may also notice differences due to the ring and sync modulated sounds. They need the other sid voice oscillator active, using correct waveform and frequency. In that case you may have to use some other method to mute the channel. Perhaps ADSR to 0 or the filter as aeeben mentioned.
Sometimes it's helpful bringing up the scope display on DeepSID to see what's going on, or record to a wav file and bring it up in Audacity.
ADSR=0 in isolation should still cause some undesired noise on gate 0->1 because there will be that 2ms attack to 15 even though the sustain volume is zero. This is part of what makes using sustain as a per-voice volume control a bit of a tricky proposition because if you ever store, for example, pulse $40 then $41 back-to-back in order to get a new sustain in the envelope generator, you'll see that momentary spike in the waveform as a quick, little triangular hat. It's very obvious for noise waveform. If you just do it once when muted and AND the target waveform with #$FE, sustain=0 should work fine unless there is some kind of oscillator leakage. Doesn't that exist where some oscillators can be heard quite faintly on some chips even when they're completely gated off?
Perhaps the only reliable way one could mute a voice because of cross-voice features like ring modulation and hard sync is at a point downstream past all the digital calculations.
If you're running this in an emulator for your own personal use such as during song development, it doesn't matter. You could just throw a register decode out there at $d41d-$d41f that does what you want.
But yeah, those clicks and snaps. :-) |
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Rub_0201
Registered: Apr 2019
Posts: 18 |
Banzai,
DeepSID is amazing. Did not know about it.
Checked a lot of buttons - did not find a scope view though.
The unwanted clicks are gone now! Went to more SIDs and Rob Hubbard plays great - project is going well :-) |
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Bansai
Registered: Feb 2023
Posts: 49 |
Quote: Banzai,
DeepSID is amazing. Did not know about it.
Checked a lot of buttons - did not find a scope view though.
The unwanted clicks are gone now! Went to more SIDs and Rob Hubbard plays great - project is going well :-)
JCH and others did a great job with that site.
There should be a tab for the scope
News / Tags / Scope / Filter / Stereo
It's not available for all players, but it should work for the regular WebSid one (not legacy).
Volume is also shown if you scroll down once waves are up, so for the usual $D418 digis, you can see them as well. |
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Rub_0201
Registered: Apr 2019
Posts: 18 |
Thanks bansai. Found the buttons. They're on the left. |
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Rub_0201
Registered: Apr 2019
Posts: 18 |
After a lot of coding, testing and debugging, it is time to go live!
I released the first demo using muting and manipulation of two sid chips.
All actions are recorded during a live session.
The recording is played back and gives the demo.
LIVE |
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Mixer
Registered: Apr 2008
Posts: 452 |
Do mashups of sid tunes. |
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Rub_0201
Registered: Apr 2019
Posts: 18 |
This first one just takes one Sid tune. So I call this a remix.
SID Mashup needs at least two of them. The next step!
I can do this by extracting „samples“ from one song and play them vs another song.
Would be nice to have BPM in HVSC to find matching songs. |
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Mixer
Registered: Apr 2008
Posts: 452 |
I'd just make the player run on timers so that you can change the call rate for each sidtune. This way you can choose your speed for each tune. Many will sound wrong, but hey, it'll be interesting and different. :) |
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Rub_0201
Registered: Apr 2019
Posts: 18 |
Uuuh, never used timer.
From the CIAs, right?
Can I set a timer and let this trigger an interrupt?
I think this is a great feature to add! |
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