Daisy Patch Input CV voltage and Control Knobs

Troubleshooting and Support
1

Hey there,

(excuse me if this has been asked before - couldn’t find a topic about this yet).

On the Daisy Patch: whats the impact of the the control knobs onto the incoming CV signal. If I connect a +/-5V LFO I get the following results.

(the resulting values are all positive - I guess no negative voltage supported)

If the control knob is at zero my value is between 0.002 and 0.846.

If the control knob is at one (fully open) my value is between 0.149 and 1.000.

So the knob basically just has a 0.15 offset function when CV is connected? Is that the expected behavior?

If no CV signal is connected the value is between 0.002 and 0.984 (~0-1).

Thanks for clarifying.

2

CV is added to the knob position as if the Knob were a 0-5V signal.

So with the knob all the way down a positive 0-5V CV input should result in values roughly 0 to 1 (due to offset error it may not fully reach both ends).

With the knob all the way up a negative 0-5V CV input should result in values roughly 1 to 0.

With the knob at noon, 2.5V should reach around 1.0, and -2.5V should reach around 0.0.

Hope that answers your question!

3

Hey @shensley,
thanks for your reply. What you described is what I had expected. Looking at the values I measured, it looks as if something is off - or?

4

I just did another run with a different source and looks as if my Erebus’ CV out wasn’t totally killing it. Looking good with the Hydrasynth and matching your description. Thanks @shensley

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5

The corresponding “pseudocode” should be:

* if Knob_Position is a value in [0,1] that represents the knob position
(0 all the way down, 1 all the way up)
* and CV is the input value in Volt, then

Knob_Value =  Knob_Position + CV / 5.0 
if Knob_Value < 0 then Knob_Value = 0
if Knob_Value > 1 then Knob_Value = 1
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