Phase 90, pot problem

[Keeb]

Hi guys I've built the Phase 90 from Tonepad ( http://www.tonepad.com/getFile.asp?id=42 ).
I got it up and running but my problem is this: when I turn the rate pot all the way CCW it sounds like a tremolo more than a phaser (it really sort of beats) and if I turn it all the way up it goes from beating to constant.

I used this pot: http://se.mouser.com/Search/ProductDetail.aspx?R=RV16AF-10-15R1-B55_-ODvirtualkey14860000virtualkey313-3000F-500K could that be the problem (using linear taper instead of reversed logarithmic?)

I can adjust the trim pot and find a sweet spot for the sound so I guess the circuit itself is working?

[GibsonGM]

It will likely work better with the reverse log pot!  Providing everything else is wire up correctly, that is  ;o)