Boss BF-2 flanger: volume mod?

[Snufkinoob]

The Boss BF-2 has a little volume jump when active so is there any mod to tame this?

I know there's a blend mod, replacing R29 (27k) with a 22k and 100k pot in series, which dials down the mix from stock 50:50 to a lower level (here's the BF-2 schematic) but that wouldn't effect the overall actual volume level would it?

I remember doing the volume drop mod on the PH-1r Phaser, which was just a case of lowering a resistor value. One of the IC1 47k's, I always forget which one. (PH-1R schematic)

So could that be done with the BF-2? I can't find anything online, and no mod kits seem to mention it, even though the volume boost does seem like a common complaint. 

[Kennt82]

I have the same problem.  I have to use it in front of the amp where the volume jump doesn't interfere as much.

The chorus/flanger blend is connected to the output buffer (Q4 is for the switch) so volume mods could affect the sound as you said.

[Snufkinoob]

Comparing it to the PH-1r mod (thanks to Slowpoke101 for digging that back up!)  R31 47k might be the one to lower (to about 39k?)

Nobody else ever tried this, or know better?

[ElectricDruid]

R31 47k might be the one to lower (to about 39k?)

Certainly a good first shot, I'd say.

The risk would be messing with the de-emphasis and messing ups the frequency response overall, and I can't work out whether this does that or not off the top of my head (too late here) but I'm guessing not.

[RickL]

I don't think that's going to work. Boss "bypasses" the effect in this pedal by just cutting out the wet signal. IC1 mixes the dry and wet signals but it's after the bypass. If you decrease R31 it's just going to decrease the overall volume of the pedal, activated or not.

Since when the pedal is activated it just adds the wet signal to the dry signal it is going to naturally be a little louder. The problem is, if you decrease the volume of the wet signal, the effect won't be as noticeable. You'll effectively just have mixed less wet signal with the dry. But it will be a little lower in volume.

The proper way to do it is to bypass the mixed signal, which you have adjusted to be the same volume as the dry signal (or with what ever boost you want), but that's not how Boss choose to do it. You'd have to completely re-engineer the pedal.

[ElectricDruid]

I don't think that's going to work. Boss "bypasses" the effect in this pedal by just cutting out the wet signal. IC1 mixes the dry and wet signals but it's after the bypass.

Ah, dammit, he's right. I wasn't thinking about the stupid bypass.

That makes it a lot harder. You'd have to first convert the pedal to true bypass by removing Q4 and jumpering it. Then you can mess with R28 and R29 or R31 to get the volume to match.

[antonis]

You'd have to first convert the pedal to true bypass by removing Q4 and jumpering it.

Or search for another JFET with muuuuuuch higher R_DS(ON)..