I'm getting kinda tired of searching & digging around here & on the net for info about this so I figured I'd just ask. I have an early 90's (maybe from '92) MXR Phase 90 (block logo) that I've owned since new & decided to break it out and fiddle with it a bit lately. I've read up on the "R28 mod" quite a bit (and other "Script Logo" mods), however it appears my unit is built differently than these newer ones. The newer ones appear to have everything attached to the PCB (switch, pot, jacks, et cetera) whereas on mine the PCB is separate (foam wrapped) and the pot, jacks, and switch are all attached to the case itself & separate. So, finding info about the difference has become quite difficult & I'm not sure where to do the "R28 mod" or if it's even necessary. Anybody here know if there's a difference? Oh, and there's also a noticeable volume drop when the effect is engaged & I don't remember if this has always happened or not. Is that normal? Any fixes for that? P.S. I did e-mail Dunlop about this, but have yet to hear back from them.