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 Forum index » DIY Hardware and Software » MusicFromOuterSpace.com designs by Ray Wilson
SoundLab LFO problems
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Limp



Joined: Apr 23, 2009
Posts: 6
Location: sweden

PostPosted: Thu Apr 23, 2009 6:07 am    Post subject: SoundLab LFO problems
Subject description: Is it supposed to work like this?
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I've stumbled upon the "musicfromouterspace.com"-website and decided to build a soundlab mini-synth. I'm not used to synth-DIY, but it's very fun to learn! I had some problem with the fine-tuners mod, but after a quick search on this nice forum, I've found the solution. The soundlab is now finished and everything is working fine except the LFO... or maybe it is, I'm not sure, it's not working the way I thought it would... well.. I have some questions:

1. When I turn on the LFO for the oscillators, say VCO1, the whole pitch goes down very low. If I then turn up the output on LFO, the pitch rises and modulation starts. And the more I turn up the LFO-output, the more modulation is being heard AND the overall pitch is getting higher. Is it supposed to be like this?? This leads to not being able to put a little modulation on a high pitched VCO1 because it drags down the overall pitch very much just by activating it on the VCO1.

2. If yes on question one, how can I modify so that the "overall" or "center" pitch doesn't change when LFO is activated? I'm planning to use the soundlab with a midi-cv-converter and midi-keyboard, and the LFO for vibrato effects, so when I flip the LFO switch on the VCO1, I want the pitch to remain the same, and then control the modulation with the LFO-output. So if the LFO-output is all the way down, nothing changes, and all the way upp, whacky pitch-modulation, get it? =)

3. The frequency-pot works fine, and Lo range is perfect, but the gap from frequency-pot all the way up on Lo range and frequency-pot all the way down on high range is to big. Preferably I'd like to make "Hi Range" less "Hi" so there's no gap in the "frequency-settings" so to speak.. Do I change the C14, or how is this achieved?^

Thanks for the help

/L
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Pehr



Joined: Aug 14, 2005
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PostPosted: Thu Apr 23, 2009 7:09 am    Post subject: Reply with quote  Mark this post and the followings unread

1. Yes, this is due to that the pot attenuates down to -9V. This is good for the VCA and VCF but for the oscillators, attenuating to ground is better to get the effect you want.

2. I've solved this with a switch to choose either attenuation to ground or -9V. Btw, in the SL+ this problem has been solved.

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Limp



Joined: Apr 23, 2009
Posts: 6
Location: sweden

PostPosted: Thu Apr 23, 2009 7:18 am    Post subject: Reply with quote  Mark this post and the followings unread

Pehr wrote:
1. Yes, this is due to that the pot attenuates down to -9V. This is good for the VCA and VCF but for the oscillators, attenuating to ground is better to get the effect you want.

2. I've solved this with a switch to choose either attenuation to ground or -9V. Btw, in the SL+ this problem has been solved.


Aha! Now i get it, Great, Thanks. A new switch seems like the way to go =)

EDIT: Question 3 anyone??
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Pehr



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PostPosted: Thu Apr 23, 2009 9:31 am    Post subject: Reply with quote  Mark this post and the followings unread

3. yes, bigger c14
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