RMC OPT-01 - GR-55 Internal Subsonic Filter board

Started by imall41, February 21, 2011, 05:24:58 AM

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lg3bass

#250
Quote from: CodeSmart on March 22, 2021, 02:52:57 PM
When it comes to the OPT-1 (as well as the Primova GKFX-1) the high pass filters are tuned to the fundamental tone frequencies of a GUITAR, not BASS (located one octave down in frequency).

Quote from: admin on March 22, 2021, 03:45:50 PM
FWIW - on a custom order basis the RMC -OPT-01 sub filter board for GR-55 may be custom ordered populated with R/C components optimized for Bass instruments


Interesting about the custom bass filter.  Can it be tailored to custom tuning? Could that be a contributing factor? I play a 7 string stringed high EADGCEG and I use fingerpicks.   Midi is tracking only on the top 6 strings (ADGCEG). 

For kicks I switched to guitar mode. I wanted to check tracking cause on on bass mode the low strings (A,D,G) drop/skip notes.  Surprisingly it actually tracked better in spots on the neck, even on the low strings.   Unfortunately guitar mode is not usable but proves the low string CAN trigger faster.



CodeSmart

Quote from: lg3bass on March 22, 2021, 07:25:44 PM
Interesting about the custom bass filter.  Can it be tailored to custom tuning? Could that be a contributing factor? I play a 7 string stringed high EADGCEG and I use fingerpicks.   Midi is tracking only on the top 6 strings (ADGCEG). 

For kicks I switched to guitar mode. I wanted to check tracking cause on on bass mode the low strings (A,D,G) drop/skip notes.  Surprisingly it actually tracked better in spots on the neck, even on the low strings.   Unfortunately guitar mode is not usable but proves the low string CAN trigger faster.
I think it's the same with guitar. Once upon a time I made a software programmable filter board (all resistors were digital pots) and I felt even a GK-3 triggered better on my GR-55 when all filters were tuned very near the fundamental of the string(almost sounding thin). The OPT-1/GKFX-1/Wayne's at 50/75/100 Hz is actually a bit off the fundamental. So maybe a better filter can be made. Best is of course if it's programmable, however digital pots are expensive and require a computer/microcontroller to set them up.
But I got more gear than I need...and I like it!

admin

#252
Quote from: CodeSmart on March 23, 2021, 03:04:00 PM
I think it's the same with guitar. Once upon a time I made a software programmable filter board (all resistors were digital pots) and I felt even a GK-3 triggered better on my GR-55 when all filters were tuned very near the fundamental of the string(almost sounding thin). The OPT-1/GKFX-1/Wayne's at 50/75/100 Hz is actually a bit off the fundamental. So maybe a better filter can be made. Best is of course if it's programmable, however digital pots are expensive and require a computer/microcontroller to set them up.

Today could use 2 of these

4in /4out 32 bit CODEC with DSP
https://www.akm.com/global/en/products/audio/audio-voice-processor/ak4962ecb/

$1.55/ea in bulk

https://www.newbecca.com/product/533318753070

https://www.akm.com/content/dam/documents/products/audio/audio-voice-processor/ak4962ecb/ak4962ecb-en-productbrief.pdf

CodeSmart

But I got more gear than I need...and I like it!

gumtown

After following the previous links, somehow I ended up else where looking at Cortex A7 SHARC dual core processors and imagining what a GK product with at least 6 of those would be like.
Free "GR-55 FloorBoard" editor software from https://sourceforge.net/projects/grfloorboard/