Hello, I have the problem that my Hapax plays the notes too low via cv. When I play C5 comes C0.
This also means that I can’t play high notes. In the setting it is -5volt to +5volt. Calibration with a voltmeter didn’t help. Does anyone have a
what does C5 show on the voltmeter?
in eurorack v/oct is not absolute, its relative.
so it sounds like the oscillator your feeding into, might well have its coarse tuning to low, so increase it.
note: there is no standard about voltage ranges for v/oct for input/output, so oscillators are different.
I look later with Voltmeter.
My Vco is Erica Synths VCO 2
C5 shows perfect 0.00 Volt
that seems ok then…
as the hapax goes C0-C10 , so C5 = mid point = 0v
(you can also see the midi note number on the hapax C5 = 60)
and so therefore C0 = -5v , C10 = +5v
its worth bearing in my that midi does not dictate what the octave numbers are…
so, different manufactures choose ‘middle C’ as C3,C4,C5. depending on if they want the lowest C to be C -2, C -1 or C0
and as I said this all becomes even more ‘irrelevant’ with v/oct…
since depending where your ‘coarse tune’ is on an oscillator, you might have A5 might be 110, 220, 440, 880hz its all relative.
modular is different, which is cool, as it leads us different places
So i think i found the Problem.
I need volt from 0.00 volt to 10 volt.
I order the Doepfer A-183-2 Offset/ Polarizer /Attenuator - Attenuator Modular Synthesizer.
why?
I just looked at the specs on the Erica Synths VCO 2
it doesn’t mention the v/oct range - but that’s a pretty unusual range for an Osc v/oct input.
(have you verfied the v/oct is unipolar)
anyway the OSC range is limited to C0-C8 (to 8v) ,
it also has a ± 3 Octave switch, so that covers 7 oct!
frankly 5 octaves with that would cover mention applications.
be very careful using an offset/attn… they won’t necessarily track well…check to see if its designed for v/oct. you have to be extra careful with v/oct.
the proper way of doing this is using a precision added - so you should use an voltage source (the A183-2 should be fine for this) but then feed that , and the v/oct signal (from hapax) into a Precision Adder module.
of course, you can fudge it, but it you’ll likely regret it
again… if you are thinking of set n’ forget of the course tune, then Id say … thats generally NOT the way eurorack works… this is why (virtually) all oscillators in Eurorack have a big tune knob… its not just for fine tuning - its expected to be used to get different ranges.
Im test with my Erica Synths Sequencer Voltmeter and note C10 =10 volts. That looks super.
as I said, there is no standard for eurorack for v/oct range. ( * )
the Hapax specs clearly state its ±5v , a not uncommon range for many modules.
(though, its hardly surprising if Erica Synths modules ‘match up’ )
(*) example:
Mutable instrument, possibly the biggest brand (after Doepfer) in Eurorack, uses -3v to +7v.
my guess is that this odd choice , was so that both ±5v and 0/10v modules would get around 5v usable.
Today Doepfer A-183-2 Offset is coming Installation complete and it work’s fine …
cool, but you would have been better off with the A-185-2, if you read that, it tells you why.
but if the A-183-2 works well enough for you, then thats ok.
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