KVR Audio

snigelx · Post by **snigelx** » Mon Aug 06, 2012 10:36 am

andy_cytomic wrote:The Moog Prodigy model was quite tricky...I've put it under the scope again:

Yeah, I can't even imagine the maths behind this shit. Extremely interesting vid. Love the presentation! my god man it follows it's every move. GREAT WORK. question, when you modulate the cutoff of the Prodigy the Drop wave in the spectrum moves as well, yet when you move the Drop by itself, its wave moves independent of the Prodigy on the time/amp wave spectrum analyisis. Why is that?

In the end, when you turn off the visuals it will be impossible to distinguish b/t the two. wow

Cheers!

andy-cytomic · Post by **andy-cytomic** » Mon Aug 06, 2012 11:00 am

snigelx wrote: Yeah, I can't even imagine the maths behind this shit. Extremely interesting vid. Love the presentation! my god man it follows it's every move. GREAT WORK.

Thanks!

snigelx wrote: question, when you modulate the cutoff of the Prodigy the Drop wave in the spectrum moves as well, yet when you move the Drop by itself, its wave moves independent of the Prodigy on the time/amp wave spectrum analyisis. Why is that?

The spectrum switches to only show only what you can hear, but the scope shows both the waveforms at once, and is triggered off a rising edge on the waveform of The Drop. The cutoffs are independent, it must just be a visual illusion that it looks like the scope waveform is changing of one waveform when the other cutoff is being modulated.

snigelx · Post by **snigelx** » Mon Aug 06, 2012 11:06 am

Scope..yeah, that's the word I was looking for

Whatever the case,...you've presented a good one. Really looking forward to the result of your labour. I just wonder how in the world you matched all the minor (somewhat unpredictable) fluctuations inherent in such analogue output,...but that is the maths portion I suppose.

Also, Andy.. Did you have a hand in FXExp's Etch at all? Just curious

n0rd · Post by **n0rd** » Mon Aug 06, 2012 11:19 am

Awesome...

What other filters are you going to simulate?

andy-cytomic · Post by **andy-cytomic** » Mon Aug 06, 2012 12:28 pm

snigelx wrote:Scope..yeah, that's the word I was looking for Whatever the case,...you've presented a good one. Really looking forward to the result of your labour. I just wonder how in the world you matched all the minor (somewhat unpredictable) fluctuations inherent in such analogue output,...but that is the maths portion I suppose.

The unpredictable fluctuations all arise from modelling the circuit properly, they aren't something added on later. They are mainly due to the self oscillation harmonics and the oscillator harmonics fighting with each other in complicated ways due to the different non-linear current flow through the circuit.

snigelx wrote: Also, Andy.. Did you have a hand in FXExp's Etch at all? Just curious

No, I didn't have anything to do with design or coding of Etch. Paul Chana has gone on record saying that it is all new code: http://www.kvraudio.com/forum/viewtopic ... 54#4862054

snigelx · Post by **snigelx** » Mon Aug 06, 2012 12:40 pm

andy_cytomic wrote:The unpredictable fluctuations all arise from modelling the circuit properly, they aren't something added on later.

Of course, that makes perfect sense, had one thought a step further ;P

They are mainly due to the self oscillation harmonics and the oscillator harmonics fighting with each other in complicated ways due to the different non-linear current flow through the circuit.

I wouldn't have thought of that, but it makes perfect sense, in the context of analogue aspect of filters. Hm, interesting. That seems like an extremely tedious measuring process. Reminds me of splicing 100pr fiber optic cable some years ago.

andy_cytomic wrote:No, I didn't have anything to do with design or coding of Etch.

I missed that thread. Thank you.

homunculus · Post by **homunculus** » Mon Aug 06, 2012 1:12 pm

sounds greattt Andy, how many filters do you have left to model?? I'm very anxious to use this baby

andy-cytomic · Post by **andy-cytomic** » Mon Aug 06, 2012 1:56 pm

n0rd wrote:Awesome...
What other filters are you going to simulate?

homunculus wrote:sounds greattt Andy, how many filters do you have left to model?? I'm very anxious to use this baby

Now I'll move onto the Roland SH-2 / SH-9 / SH-101 / Juno 60 filter. Each one is slightly different so I'm going to breadboard them and see which I like best, I have 4 IR3109 chips and 4 BA662 chips, the rest of the components are pretty standard in the circuits. After that is the finalising of the MS20 rev1 filter, which I already have a pretty good model but I need to add a couple little extra bits to it to get it sounding right.

snigelx · Post by **snigelx** » Mon Aug 06, 2012 2:05 pm

andy_cytomic wrote:Now I'll move onto the Roland SH-2 / SH-9 / SH-101 / Juno 60 filter.

Have a 60 here. I can listen to this baby on hold all day, I swear. Something about these envelopes too. I heart it. Anyway, good luck with your tests and big thanks for the update here, fun to watch it come together.

shalako · Post by **shalako** » Tue Aug 07, 2012 7:36 am

andy_cytomic wrote:Now I'll move onto the Roland SH-2 / SH-9 / SH-101 / Juno 60 filter.

I love the Juno sound!!!!! (more so the my moog....oh no he didn't!) I have a 106 but it's broken at the moment

I'll be looking forward to hearing a Roland model!!

andy-cytomic · Post by **andy-cytomic** » Tue Aug 07, 2012 8:38 am

Here is another take of The Drop head to head with the Moog Prodigy, this time I've matched the audio levels of the two! I had a separate send for the oscilloscope so things looked matched, but I didn't match the audio levels properly on the last video, the volume of The Drop was lower than the Prodigy. This is basically the same thing, but a bit fairer a comparison. Thanks to Karloff70 for letting me know about this!

homunculus · Post by **homunculus** » Tue Aug 07, 2012 12:43 pm

I really cannot tell the difference! Andy please send me this already, I'll give you the money right now!! I really will!

sqigls · Post by **sqigls** » Wed Aug 08, 2012 2:13 pm

@ homunculus - I've tried every tactic under the sun, Andy is a rock.

damn incorruptable perfectionist software types...

homunculus · Post by **homunculus** » Wed Aug 08, 2012 3:49 pm

sqigls wrote:@ homunculus - I've tried every tactic under the sun, Andy is a rock.

damn incorruptable perfectionist software types...

lol I hear you man, I need this beauty so bad! I use filtering a lot in my music, I would definitely give Andy my money right now and just use the algo's that are done

though i am sure his perfectionism will benefit us greatly. I even bought the new macbook pro for this plug because I knew that my dualcore iMac was not going to be powerful enough for the Drop

gentleclockdivider · Post by **gentleclockdivider** » Wed Aug 08, 2012 6:40 pm

andy_cytomic wrote:
n0rd wrote:Awesome...
What other filters are you going to simulate?

homunculus wrote:sounds greattt Andy, how many filters do you have left to model?? I'm very anxious to use this baby
Now I'll move onto the Roland SH-2 / SH-9 / SH-101 / Juno 60 filter. Each one is slightly different so I'm going to breadboard them and see which I like best, I have 4 IR3109 chips and 4 BA662 chips, the rest of the components are pretty standard in the circuits. After that is the finalising of the MS20 rev1 filter, which I already have a pretty good model but I need to add a couple little extra bits to it to get it sounding right.

All right ,so why did you announce 'the drop ' a year ago ?
Looks like we have to wait another year ..

Anyway , take your time , the examples sounds really fantastic , and I will by this one in a heartbeat .
So excited
Keep up the good work

Cytomic "The Drop" Resonant Filter