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Logarithmic Expression Pedal Control for Low Pass Filter


Meiannatee
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I'm building a synth-like patch, with the built-in Helix expression pedal controlling the high-cut (low-pass) frequency of the Low and High Cut block.

 

With the pedal min at 1kHz and max at 11kHz, there's not enough fine control at the low end. If I drop the max range of the pedal, I won't have enough highs with the pedal fully down. If there's an option for a logarithmic sweep like in the Volume block, that will solve the problem. Unfortunately, I can't figure out how to do that. Care to help?

 

And yes, I've tried using the Wah blocks, but all of them have a very pronounced resonance peak at the cut-off frequency of which there's no control to cut out.

 

Side problem: Is there a low-pass filter block that goes lower than 1kHz?

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On 7/23/2021 at 7:28 AM, Meiannatee said:

I'm building a synth-like patch, with the built-in Helix expression pedal controlling the high-cut (low-pass) frequency of the Low and High Cut block.

 

With the pedal min at 1kHz and max at 11kHz, there's not enough fine control at the low end. If I drop the max range of the pedal, I won't have enough highs with the pedal fully down. If there's an option for a logarithmic sweep like in the Volume block, that will solve the problem. Unfortunately, I can't figure out how to do that. Care to help?

 

And yes, I've tried using the Wah blocks, but all of them have a very pronounced resonance peak at the cut-off frequency of which there's no control to cut out.

 

Side problem: Is there a low-pass filter block that goes lower than 1kHz?

 

As far as I know there are no EQ blocks on the Helix that have a low-pass(high cut) filter that goes below 1khz. The only thing I can think of that might work is somehow using the 'Split Crossover', which goes down to 25Hz, to maybe rig something up to your liking.

 

I guess another approach would be to get tricky and have the expression pedal work two or more parameters simultaneously on the Parametric EQ. The 'Tilt EQ' also has a 'Center Freq' parameter that can be set as low as 100Hz.

 

Don't know of any way to explicitly set the curve to logarithmic for any block other than 'Volume'. 

 

Note: The Helix EQs do have the high pass(low cut) filter available down to 20Hz but you were probably already aware of that.

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Look in the Filter Section, under Legacy, and try the Q Filter.

Im not sure the frequency it goes down too, but its going to work a lot better than a wah or eq.

The expression pedal has plenty of control in the lower ranges when used on Freq value with this effect.

 

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