[sdiy] Glide Pitch Drop?

[xamboldt]

Hi Everyone,

I'm modding a sequencer to add a simple glide out, so I copied the glide
section from John Blacet's old "Digital Pattern Generator":

http://www.blacet.com/dpg1.jpg

I didn't use the 50k output attenuator, just took the CV out from the
sequencer and fed it through the glide circuit exactly as shown in the
schematic. I'm using a TL074 for the opamps.

If I have the glide set to 0, then the voltage out of the glide CV out is
the same as the non-glide CV out. The problem is, once I turn the glide up a
bit, the CV out drops a little. Not the greatest thing to happen if you get
a sequencer set up to the right pitches, and you just want to add a little
portamento, but in order to do so you have to reset all the sequencer
controls to compensate for the voltage drop.

Any ideas on how I could fix this? Or is a different circuit my only hope?

Thanks,
Chris