Lately Bass

ian-s · Posted: Sat Feb 04, 2006 2:57 pm Post subject: Lately Bass

G2 version of a TX81Z factory preset.

According to a shareware editor, the original used triangle on op1,2 & 4 but I cant get it to sound even close with the G2 PM oscillator triangle. Also the envelope is a little different, I've routed the env out through it's own vca to get closer to the TX81z shape curve.

Lately.pch2

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TX81z LatelyBass

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Lately.pch2

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BobTheDog · Posted: Tue Feb 07, 2006 9:46 am Post subject:

Hi Ian,

I hope you don't mind me asking a bit of a beginner question here?

I like the sound of this patch and am trying to get my head around how it works.

I am starting by trying to understand the right side with the OscPM2, EnvADSR1 and LevMult1 modules.

In the EnvADSR1 module you feedback the output of the envelope into the input, I am trying to get my head around this and failing, why are you doing this?

Cheers

Andy

Kassen · Posted: Tue Feb 07, 2006 10:49 am Post subject:

That's a classical trick. Basically it's like multiplying the signal with itself which gets you a different curve.

Works in may systems but anoyingingly not in the NM A-D envelope which for reasons that are quite beyond me S&H's the mod input at triggering time.

ian-s · Posted: Tue Feb 07, 2006 12:21 pm Post subject:

BobTheDog · Posted: Tue Feb 07, 2006 12:46 pm Post subject:

Hi Guys,

Thanks for the replies.

I have been looking a bit more and noticed the EnvD1 does the same thing, I am going to make a simple patch so I can hear the difference in the envelope.

Also Ian, just so I get this right in my head, the feedback to OscPM2 is modulating the phase not the frequency so why is it called feedback FM?

Once again thanks for your help.

Cheers

Andy

BobTheDog · Posted: Tue Feb 07, 2006 1:10 pm Post subject:

Hi,

I have done my test and now see how it works, the decay sort of accelerates. I also had a go putting the ShpStatic module between the env output and input, which changes it quite drastically.

I also tried taking the env out and multiplying it by a lfo before feeding it back and got some very interesting results that totally confuse me, changeing the lfo frequency changes the frequency of the output!

Why is this?

Cheers

Andy

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ian-s · Posted: Tue Feb 07, 2006 2:27 pm Post subject:

blue hell · Posted: Tue Feb 07, 2006 2:36 pm Post subject:

BobTheDog · Posted: Wed Feb 08, 2006 1:20 am Post subject:

Hi Jan and Ian,

Concerning the Phase mod / FM stuff. Now I get the idea that this is a FM patch it makes a liitle more sense (in the way that I have no idea how FM with more that two operators work) basically op 1 and 2 are summed then FM modulate op 3 which then fm modulate op 4, is this correct?

So basically the signal being fed into the envelope has become an "audio" signal, this is then multiplied by the osc giving me ring modulation which is why it sounds a bit bell like. I understand now (I think!).

The thing that was confuseing me was that I thought I was just changeing the amplitude of the env.

I will have a look at the ring modulation sections in the manual and also play with replaceing the LFO with an OSC and shortening the decay time to see what happens.

Thanks for all your help

Andy

ian-s · Posted: Wed Feb 08, 2006 1:46 am Post subject:

BobTheDog · Posted: Wed Feb 08, 2006 3:32 am Post subject:

Hi Guys,

Thanks alot for all the help.

Cheers

Andy