15 replies to this topic

[igi]

Hi ALL!

I'm working on MIDIBOX SID DARK MATTER sound extension module.
(Any similarity with Dark energy is just coincidence)
This is actually controlling two CEM3394 with MB SID V2 via Aout module and
outputs on J5.(for wave select)
Almost finished and thanks to TK's great SC and Aout's working great.
But there is one problem.
I try to use envelope generator 1 or 2 for controlling VCA via level, but if I set
EG depth to full (128) voltage is not working on full range.(0-5V).
If I control level with ext.controller then I can get voltage from 0 to 5V.(like it should)
Should EG work on full range, or I miss something (again)???
PW, Cut off, reso... works fine with full range.

Thanx in advance and Best regards,IGI

[technobreath]

Daaark matta! Nice - love it.

[nebula]

Wowwww.... I have been wanting to do exactly what you're doing for a long time. I have a Sequential Six-Trak and I think the 3394's sound so nice, but its Z80-based implementation is so limiting by today's standards - slow envelopes and coarse resolution on controls.

I could check the voltages on the VCA pins if you like to figure out what the chips are getting in the Six-Trak. Might take me a few days to get to it though, so let me know!

Edited by nebula, 09 March 2012 - 04:45.

[strophlex]

I have made a similar box with PSU, 4xAOUT_NG boards, 4xSSM2044 boards and 2xSSM2154 boards and experience the same problem. I have intended to ask about this too, but you beat me to it. I can change VCA level ful range via level setting in the MB SID, but if I route EG 1 or 2 to level and set it to full depth, I still cannot get full range amplitude modulation. I don't remember if I have tried this with the LFOs.

[igi]

HI!
@nebula: VCA voltage for CEM3394 is 0 to 4V.
Problem is not CEM, but voltage from Aout.
Yes, CEM sound is really nice
I also have some problem with pitch voltage stability. (not because MBSID)


@strophlex: same problem with LFO's, but EG full voltage range
for VCA is must. I cannot live without it.

We still waiting for TK!(I think

Best regards, IGI

Edited by igi, 10 March 2012 - 21:05.

[Macron]

Wow! I have the similar problem with CEM3379 in my MBSID V2. Perfect control (I use AOUT modul) VCF section (cut off and resonance control is ok), but problem with control of VCA section of 3379. I can change VCA voltage via menu parameter "volume", but I also try to route EG on VCA via matrux - no result . Whats wrong?

[strophlex]

Wow! I have the similar problem with CEM3379 in my MBSID V2. Perfect control (I use AOUT modul) VCF section (cut off and resonance control is ok), but problem with control of VCA section of 3379. I can change VCA voltage via menu parameter "volume", but I also try to route EG on VCA via matrux - no result . Whats wrong?

If you don't get anything out the VCA, did you set the depth parameter of the EG or LFO? Anyway it seems the output range of modulation of volume if not as it should.

[TK.]

There are two depth parameters: one for the ENV depth, another for the modulation depth (in the modulation matrix).
Both are set to 50% by default - I guess that you forgot to set the modulation depth to 100% (128)?

Best Regards, Thorsten.

[igi]

HI!

I have MBSID almost a year now, but I didn't know that I can
adjust modulation depth. (please, don't call me stupid )
This box is really full of nice surprises!
I can't test right now, but if TK say so, then should work.
I will report next week about results.

TK, many thanks for your support!!!

Best Regards, IGI

[strophlex]

Argh... I cannot get this to work.

Again, CFG -> VOL works perfectly. If i set an external filter (After SID but before VCA) in resonance I can adjust the volume with this setting, so I am 100% sure the VOL setting is forwarded via AOUT to the VCA.
Then, in the modulation matrix, I assign one modulation source to VOL and set the depth param of both the EG/LFO and the modulation to 127. I doesn't matter if I use EG or LFO, same result. Only about 50% modulation range. Only half range if I use negative depth too. There must be some setting I am missing...

[julienvoirin]

AOUT NG design is buggy in dual mod. you can't have +/- 5V but only the half : it's mentioned in the forum somewhere but i can't find

[Shuriken]

AOUT NG design is buggy in dual mod. you can't have +/- 5V but only the half : it's mentioned in the forum somewhere but i can't find

It's this one

[strophlex]

I am pretty sure the AOUT channel for the VCA module is configured in unipolar mode plus it works fine when controlled from the CFG -> VOL menu. I don't think it is that module. It must be something in the software.

[igi]

Hi!

At least I foud some time to test Aout module, but with same results like Strophlex.
I get 0 to 6,1 V with external controller volume control or with "Knob assigement to volume.
With EG or LFO i get just 0 to 3,02V. (All depth's set to full (127))
So, problem is not in Aout or AoutNG module, but I also think in software.

Best regards, IGI

[igi]

HI!

Same problem also with V2_040 and AoutLC.

Best regards, IGI

[strophlex]

bump