[PD] DC weirdness, any ideas?

All, I was looking at a diskwrite in Sound Forge of a set I did and noticed something really strange, and was hoping that someone here could explain it. If you take a look at http://mentalfloss.ca/sintheta/images/dc.png you can see there's some sort of weird DC increase near the end of the track (the scale is in minutes, btw, not seconds).

     My signal chain for this is a delay (infinite) -> LP -> EQ -> 

reverb -> compressor~ (set as a limiter).

     The delay is scrubbed and screwed with, so that every change is 

recursive in the delay line. Dunno if that has something to do with it, but near the weird DC part all I was doing was adding sound to the line.

     Any ideas? This totally baffles me.

David

. . David McCallum . Music wants to be free . http://mentalfloss.ca/sintheta/ .