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Comments
That Instability Engine sounds rad! Added to the watchlist thx
Yes, all Bram's manuals are excellent. The only one I find lacking in a few areas is the Rozeta Suite.
@wim @Squishy @offbrands thanks again for taking a look. I originally thought that this was a bipolar vs unipolar thing because the looping EG, which I believe is unipolar, works as expect it to, and using the LFO to modulate the VCA or filter cutoff works fine too. I think we really do need @brambos to clarify
Those waveforms look like the derivatives of the nominal waves. Square becomes pulse, triangle becomes square. Sine becomes cosine (same shape, different phase), so you cannot tell. This could happen if there was some AC coupling (or HP filter) in the circuit. From the descriptions of the effect of the LFO on pitch, it sounds like that is happening inside the app, not some funny AC coupling in the scope app, etc.
Right on the money there.
The VCA output is not a 1:1 "clean" output. Among a number of other things, it has a soft saturator which wave-shapes anything approaching or exceeding maximum amplitude (which LFOs often do).
Additionally, there's a big capacitor on the output, which does two main things: removes DC offsets (so everything looks perfectly centered on 0, even if in the internal signal path it may not be) and it works as a high-pass filter, which only cuts out inaudible (but high-energy) low rumble. Those are typically the frequencies that LFOs fall into. So it's very hard to see the real shape of an LFO on the scope if you send it out of the VCA.
The reason sines look like sines is that they're single-frequency waves. There's not much to take away from a sine other than amplitude
Thanks for the thorough explanation, it makes total sense in regards to trying to analyze the LFO behavior this way. Can you comment on its effect on the VCO frequency that I mentioned here?
Yes, thanks for the explanation @brambos. But I'm confused as to why the effect on the vco frequency sounds (to me) effectively like the way the lfo looks on the scope, and nothing like, say, a square wave modulation would sound.
Yes, that mystery is easily solved: CV input for pitch-voltage should always be positive, so whenever negative values are received they are simply inverted by stripping the sign.
That's why the square LFO responds like an extreme pulse when fed into the pitch, and why the up/down sound like triangles. They all flip down the middle.
If you feed the LFO into the filter you'll hear they actually behave like they should.
Speaking of pitch CV: our CV-->Pitch algorithm should be compatible with VCV Rack's and a bunch of other software modulars'.
I haven't tried with miRack, but I'm 90% positive it will conform to the same 1V/O CV convention too so if that works you could use miRack as a sequencer (not sure about Drambo).
By the way, there is a hack to make LFOs unipolar, using the Utility section.
When you don't patch anything into in 1 it will simply output a constant voltage.
Now patch your LFO into in 2 and use att 1 to shift the mixed signal up or down.
Wow! Awesome.
Thank you so much for taking the time to explain all that in detail @brambos.
Whoa, that cv out to other software is pretty damn cool…
@brambos thanks again! So it was indeed a polarity thing, I feel validated
Thanks for the explanation @brambos , particularly about the utility section. When I tried something similar it didn’t work because I’d forgotten the constant voltage only works with input /output 1 - I should really re-read the manual as it’s clearly explained there. 😳
In fairness, it’s a really exotic power user feature (one that I use a lot on my 0-Coast though).
Bought Solderbox yesterday thanks to the generous sale - thanks @brambos and @jakoB_haQ, I’ve already had my money’s worth in fun with it.
Just want to ask a quick question to check something. Am I right in thinking it’s not velocity sensitive? When I’ve tried adjusting velocity levels that seems to be the case - no changes heard except silent at 0 velocity.
If it’s user error, how do I set it up to respond to velocity? Thanks.
No, you're right, there is no velocity. Incoming MIDI notes don't do anything that isn't available in the modular design itself:
Since the EG module doesn't have velocity the MIDI velocity isn't used anywhere.
Cool, thanks for confirming @brambos, really appreciate it. Cheers.
I see it’s priced at £6.99 at the moment. I take it this is the sale price? How much does it cost normally & how long does the sale last?
Usual price is £12.99 i think.
Great - thank you 👍🏻
These are holiday prices, so I'd not expect them to last past Thanksgiving or "Black Friday".
Indeed! There is also a subtle hint in the image itself..
Darn! I am terrible at ciphers.
A but you left out the year, leaving us hanging.
At the rate Black Friday evolved into Black Week and now Black November it's not far fetched to expect 2026 to be Black Year.
“No colors anymore
I want them to turn black”