Profex 2 or Bassfex 3 wire hookup

[Ken Fox]

We were discussing effects and the order of such under the post to Buddy Emmons. I have had a request to explain how I use a Profex 2 or Bassfex with he pedal as an effect.
What I have tried is using the "FX" in a patch. I place it before the reverb, chorus or delay but after any compressor or distortion effects. Try the "SEND" and "RETURN" levels at 100, with the "SUM" off and the "DIR" at 0. Guitar plugs directly in the front of the FX. This wroks just as well with a Tubefex or Transtubefex. The results are very good.
When I run a patch with distortion or compressor I usually use a pedal board, that way I can turn those off and then save the patch with those toggled off. When I come back to that setting, they are in lower case letters and off. The pedal board shows "on" effects as a green LED and "off" effects as a red LED.
What you have is a "Matchbox" or a "three wire" amp hookup. The guitar is feeding directly to an opamp input. The SEND is from another 4558 chip (this could be changed to a Burr Brown chip, Peavey does not include any in their kit for this, neither does LeMay). The return is right back into another 4558 chip. A nicely buffered input and output!

[Jim Smith]

Good point Ken. I do the same thing with my Boss GX-700, so I suspect one could do this with any effects unit that has a movable effects loop.

[Bill Crook]

Ken.......

Be careful about changing out ALL the 4558's in the "Profex II". The results may not be what we want it to be. Some of the OPA's are not in the signal freq responce path and may adversely alter the desired sound.

Been there,,,,, Done that.

Bill

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[Ken Fox]

Good advice, Bill. I really can't tell a big difference in the OPA series and the original chips. Maybe it's just my tin ear! I know they do not sub well at all for the TLO72 chips! Tryed it in a Mace VT series and went back to the TLO72s.