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nhaudio
Joined: Jan 24, 2010
Posts: 7
Location: Barcelona, Spain
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 Posted: Sun Jan 24, 2010 5:03 am Post subject:
Sound lab mini synth + constant sound on
Subject description: pb with Sound lab mini synth + constant sound on |
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Hi Guys,
Just finished building my mini synth +.
Everything seems to behave correctly except for the fact that I always get a sound even when a gate CV controller is inserted.
The synth responds fine to control voltage, meaning it changes pitch, but the sound is always on.
I'm thinking of a miss wired cable but I double checked everything and it seems to be ok. Any clues and where to look except from the panel wiring? Could it be a bad 13700 (the one for the VCA section?)
Also a few extra doubts, as I'm not sure I understood very well from ray schem comments, In order to get a constant note with no cv trigger, the switch (Mode Gate/Trig) should go to the Trig position and then I can choose Internal repeat or S&H Trig. Am I correct?
If I want to use a gate CV, I put the switch (Mode Gate/Trig) the the gate position and the switch (Internal Repeat/S&H Trig) to the middle position as suggested by ray in his comments.
thanks again for your help,
Cheers,
Nico |
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isak
Joined: Dec 13, 2009
Posts: 847
Location: Israel
Audio files: 18
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| Posted: Wed Jan 27, 2010 3:05 am Post subject:
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Hi
i'm not a big expert, but..if u say that everything works fine then its reasonable that the manual gate push button is dameged, try to replace it.
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urbanspaceman
Joined: Feb 26, 2008
Posts: 78
Location: italy
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| Posted: Sat Feb 27, 2010 2:10 pm Post subject:
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nhaudio have you fixed your problem?
i have the same problem...
any suggestion?
tnx |
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nhaudio
Joined: Jan 24, 2010
Posts: 7
Location: Barcelona, Spain
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| Posted: Sat Feb 27, 2010 5:45 pm Post subject:
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| isak wrote: | Hi
i'm not a big expert, but..if u say that everything works fine then its reasonable that the manual gate push button is dameged, try to replace it. |
thanks for the tip but did a continuity check on the switch and it's good.
| urbanspaceman wrote: | nhaudio have you fixed your problem?
i have the same problem...
any suggestion?
tnx |
not really no  I haven't worked much on it. I really think I'll have to triple check everything. I didn't have much time lately. But still if anybody could help answer my question:
when the mini synth is working fine: if in mode gate---> synth is always on if in trig mode---> synth only response to input cv and plays pitch accordingly? is this correct?
regards,
Nico |
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alieneYe
Joined: Jul 25, 2008
Posts: 38
Location: Phoenix, Az
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| Posted: Sat Feb 27, 2010 11:50 pm Post subject:
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the Gate input of the Soundlab is part of the ENV. in order for the gate to effect amplitude the amp mod switch needs to be switched to ENV, the initial amp gain turned down (just enough to stop the constant tone from going through) and hit the gate. the synth should then work how you want it to.
i've built 2 of these and they both act this way for me. i'm an "intermediate" novice at electronics so i might have put them together wrong, but somehow i think it a slim chance that i made the exact same mess up twice.
perhaps others may have some light to shed on this?
hope this helps:) |
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isak
Joined: Dec 13, 2009
Posts: 847
Location: Israel
Audio files: 18
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| Posted: Sun Feb 28, 2010 1:02 am Post subject:
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| Quote: | | the Gate input of the Soundlab is part of the ENV. in order for the gate to effect amplitude the amp mod switch needs to be switched to ENV, the initial amp gain turned down (just enough to stop the constant tone from going through) and hit the gate. the synth should then work how you want it to. |
this is the way the SL shuold work, mine is the same.
BTW.. from curiosity, how is u'r VCF section? is it like this ?
http://electro-music.com/forum/topic-39834.html
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nhaudio
Joined: Jan 24, 2010
Posts: 7
Location: Barcelona, Spain
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| Posted: Mon Mar 01, 2010 5:20 pm Post subject:
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| isak wrote: | | Quote: | | the Gate input of the Soundlab is part of the ENV. in order for the gate to effect amplitude the amp mod switch needs to be switched to ENV, the initial amp gain turned down (just enough to stop the constant tone from going through) and hit the gate. the synth should then work how you want it to. |
this is the way the SL shuold work, mine is the same.
BTW.. from curiosity, how is u'r VCF section? is it like this ?
http://electro-music.com/forum/topic-39834.html |
thanks Isak and alieneYe for the clarification...I'll try tomorrow and check. (just to make sure when you say "the amp mod switch needs to be switched to ENV" we're talking about the switch in the vca section--->modulation switch needs to be set to AR-GEN and not off. anyway I'll try tomorrow).
Isak I'll check how the filters are behaving tomorrow and let you know,
thanks again for the help,
Nico |
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isak
Joined: Dec 13, 2009
Posts: 847
Location: Israel
Audio files: 18
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| Posted: Tue Mar 02, 2010 5:37 am Post subject:
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| Quote: | | just to make sure when you say "the amp mod switch needs to be switched to ENV" we're talking about the switch in the vca section--->modulation switch needs to be set to AR-GEN and not off. anyway I'll try tomorrow. |
yes. 
waiting for u'r reply about the filter section my friend
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nhaudio
Joined: Jan 24, 2010
Posts: 7
Location: Barcelona, Spain
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| Posted: Tue Mar 02, 2010 1:58 pm Post subject:
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| isak wrote: |
yes.
waiting for u'r reply about the filter section my friend |
small update:
On the good news, I've figured out the vca initial amplitude. As you all kindly advised, you just need to set it up right. So now it triggers via CV but it triggers a weird way. It seems that the attack is set to max and so is the release.
ie: if I press a note it takes about 3,4 sec for the sound to reach its max amplitude (attack knob though is at minimum) there is some sustain (during this time when i play a note it triggers directly) and then release which is really slow too (release is set to minimum). It's quite a bummer to play drum parts (impossible). Are yours behaving the same way? I think I need to triple check the a/r EG section
Regarding the filter: I couldn't listen to the sample (it seems that the file is gone) but I've found that if the modulation switch in the via section is set to AR-Gen then the wobbling/overdrive is much stronger.
If this switch is off, it sounds like this:
http://www.nhaudio.com/filter_sound_lab_mini.mp3
(first BP then LP) |
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RF
Joined: Mar 23, 2007
Posts: 1502
Location: Northern Minnesota, USA
Audio files: 28
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| Posted: Tue Mar 02, 2010 2:58 pm Post subject:
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Sounds like you should check how you wired those attack/release pots...
bruce
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"I want to make these sounds that go wooo-wooo-ah-woo-woo.”
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isak
Joined: Dec 13, 2009
Posts: 847
Location: Israel
Audio files: 18
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| Posted: Wed Mar 03, 2010 3:43 am Post subject:
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u'r filter sounds sweet
about the AR Gen.. as Bruce said check the wire of the AR pots.
update us about u'r issue.
Isak.
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nhaudio
Joined: Jan 24, 2010
Posts: 7
Location: Barcelona, Spain
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| Posted: Wed Mar 03, 2010 7:18 am Post subject:
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| isak wrote: | u'r filter sounds sweet
about the AR Gen.. as Bruce said check the wire of the AR pots.
update us about u'r issue.
Isak. |
will check the a/r section...
your filter is not sounding the same? |
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isak
Joined: Dec 13, 2009
Posts: 847
Location: Israel
Audio files: 18
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nhaudio
Joined: Jan 24, 2010
Posts: 7
Location: Barcelona, Spain
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| Posted: Thu Mar 04, 2010 5:51 pm Post subject:
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| isak wrote: | | unfortunately no |
sad to hear. Are you using lm13700D or lm13700N?
On my side no luck on the A/R prob. I've checked everything and it seems to be fine. It seems though that I have a cycle always going back. I think you can hear on my .mp3 sample when I'm reopening the filter in low pass. Any clues where to look?
nico |
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