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PostPosted: Thu Jan 03, 2013 5:31 pm 
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Joined: Thu Jan 03, 2013 5:23 pm
Posts: 1
Hi,

I've just discovered the byoc website, and have seen several discussions on bass modding. My question is:
"Do the instructions included with the build kits specify how to mod the pedal for bass, or is some sort of outside knowledge needed?"

I've never purchased a byoc pedal before. And considering that I exclusively play bass, I don't want to get in over my head with a mod that would be too difficult. I should also note that I have no previous experience in pedal building or electronics.

Thanks for your time,
Mr. Hayes


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PostPosted: Thu Jan 03, 2013 5:39 pm 
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Joined: Sun Nov 18, 2012 5:13 pm
Posts: 3758
Location: Soddy Daisy,TN
Some do, you can download the pdfs and read them before you order. As a bassist myself, I started with the opticomp.

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Pedal building is like the opposite of sex. All the fun stuff happens before you get in the box.


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PostPosted: Wed Jan 16, 2013 7:33 am 
Filtering and coupling capacitor values in guitar effects are normally chosen to accommodate the frequency range of the guitar and the bass is normally pitched 1 octave below the guitar.

So as a very rough rule of thumb you can replace all filtering and coupling capacitors in an effect with capacitors of double the value. For example in the Envelope Filter you might replace the two 0.01uF filter caps with 0.022uF to move the range of the filter down by 1 octave. This works fairly well for filter caps, but input, output and inter-stage coupling caps are often plenty large enough in value that there is no benefit in replacing them.

To be sure you would have to look at the circuit to see what impedances are involved and then calculate the impedance of the cap in question at 40Hz (roughly the frequency of the bottom note on a normally tuned 4 string bass). For example if you have a 0.1uF input coupling cap feeding an input buffer with an input impedance of 1Meg, at 40Hz the impedance of the cap is about 39.8K. This is small enough in relation to 1Meg that the frequency response would only be down by a small fraction at 40Hz so it would not be worth changing the cap.

Or you can not bother with the calculations, assume all coupling caps will be too small for bass and just double all of them.

The complaint that bassists often make about effects is that they lose the bottom end, so another solution is to use a blender or parallel mixer that splits the signal into a clean path and an effect path and then mixes the two back together, so the low end is preserved by the clean signal path. Using a blender you may find you can get away with leaving any guitar effects unmodified.

And of course you can look for threads in the mods section of this forum where other builders may report on successful bass mods.


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