What kind of Envelope has the Roland TR-03 and what does the Parameter do?
The Roland TR-03 has an 'Envelope' Parameter. I know many different kinds of Envelopes exist which are made to adjust different parameters:
Amplitude
Pitch
Low-/High-Pass Filter
...
Question 1: What kind of 'Envelope' is it in the TR-03?
At second, a classic envelope has 4 Phases: Attack, Decay, Sustain and Release (ADSR). Other Machines provide 4 knobs to adjust these 4 Phases. One for each Phase. But on the TR-03 there is only 1 knob for the Envelope.
Question 2: What does the Envelope knob do on the TR-03?
Owner´s Manual is located here, but it doesn´t answer my questions: www.roland.com/global/support/by_product/tb-03/owners_manuals/
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It's a re-creation of the original TB-303. There are two envelope generators, but only one of them is connected to the control you are asking about. The envelope knob controls the amount of the filter envelope that is sent to the filter cutoff frequency.
The attack time of the filter envelope is fixed. I haven't found exactly what it is, but one place suggested it might be 3ms.
The decay time of the filter envelope is controlled by the Decay knob, but the knob is partially bypassed on accent steps.
The Envelope knob controls how wide the filter sweep is. At least on the original 303, even if you turned the knob all the way down, there was still a bit of filter sweep. Accented steps are also affected differently by the Envelope knob, in that there is a boost to the maximum cutoff frequency of the envelope, helping to make the accent steps sound louder.
This page has a great analysis: www.firstpr.com.au/rwi/dfish/303-unique.html
Quoting:
For both normal and accented notes, the [filter] EG affects the filter
frequency via the [Envelope] pot. However the circuitry does not
allow this effect to be turned down to zero even when the pot is
fully anti-clockwise.
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