feedback help

[RockfordStone]

hi guys, i wonder if you could help me out here

i am currently running an ampeg svt pro 3 amp and i am suffering terrible screaming/feedback when i kick the distortion in (i am told by a venue i played recently its not coming out of the amps di, only the speaker)

my current line includes a sansamp di to give me some of my tone and an ibanez pd7 phat hed distortion.

my initial guess was that the combined gain from the 2 pedals was causing it, but i currently have both the pedals gains/levels, and the amp gains set at a about 30% and i am still getting the issue.

my question is, has anyone else ever had this issue, or know any easy way of cutting this out.

i have considered getting an additional volume pedal to cut the output before it gets into the amp but not sure where to start.

cheers in advance

[0175westwood29]

is the feedback only happening when you hit on the pd7?

i'd go through every part of the rig starting at my bass and see where the feed back comes in.

i dnt get feedback on my rig till i have massive amounts of gain stacked up, my bass maxed on volume(its an active bass so has a hot output) then into a swollen pickle on about 12oclock, then into a odb-3 on a similar volume setting but with the gain at about 2oclock. but i dnt get feedback till i turn on my metal muff which is cranked on the high end. and my db750 has its gain at about 2oclock so its pretty gain heavy with no gain being added anyway

maybe your boosting a high frequency with out realising? i had this when i used to use a boss md-2, it just grabbed the bad frequency and caused feedback when i wasnt playing.

hope atleast some of that helps?

andy

[TomWIC]

I'm so glad I used the search function, I'm using a Sansamp PBDDI and a Ibanez PD7 in my rig - was rehearsing tonight, and sure enough whenever I turned on the PD7, I get horrible feedback.

I found that cutting the treble and presence down enough on the Sansamp cured it, but at the loss of the tone I wanted from the Sansamp! Very annoying. I'm using fairly decent Planet Waves patch leads, so I'm wondering if the same thing happens when powering the PD7 from a battery rather than the cheap power brick I'm using at the moment.

My signal chain is:
Bass -> Instrument Selector -> Tuner -> Compressor -> Synth -> Wah -> Ibanez PD7 -> Boss ODB-3 -> Sansamp PBDDI -> Amp

I don't think I had an issue with feedback when I switched on the ODB-3, so maybe it's just an issue with the PD7? It's a shame, it's a great pedal that gives me the perfect amount of grit to my tone (set on Clean, with Attack on 1, Low and High between 12 and 3 o'clock).

I tried setting the level on the PD7 down as much as I could (before turning down the treble and presence on the Sansamp) but didn't really have much luck. I've heard the phrase "unity gain" thrown around a lot, but I don't really know what it means and how to achieve it!

Any ideas?