I dont really get what the question is? Are you asking if this is unique to your HD (i.e. is a fault ?) .

I'd be interested in checking this out when I get home, though I would imagine what you are experiencing is correct.

I have another old fx/modelling unit that does a very simial thing with stereo fx. In fact probably more so, as some basically route the original signal through one channel and the modulated signal through the other. This sounded a little odd initially, and more and more odd the more I focussed on it. In reality though, once I got over it I stopped noticing. It would probably be fairly bad isolated in headphones, but at a reasonable listening distance from my PA speakers it sounds pretty good over the stereo field.

I've seen similar behavior with any time-dependent parameter as a result of editing the tone in HD Edit on my computer as opposed to directly on the unit. Despite saving a tone with the same timing/feedback on either channel, and testing it to make sure it was good, after switching away and switching back to the tone it would be all out of whack. This is not an issue if you edit the tone right on the Pod without being connected via USB. Just go in and tweak the relevant parameters (even if they appear the same, just change them to something else and back), save the tone, switch away and then switch back to it. Please try doing that and report back.

OK.. so I tried this out for myself (on HD500).

Please bear with me as I haven't really delved into the stereo delay before.

When I first added the effect I immediately noticed the phenomenon you detailed, but then also noticed I had unbalanced feedback settings. I evened them up to 50 each on HD edit, but still got the issue of the right channel repeats being louder and lasting longer than the left.

I then edited the parameters on the unit itself - essentially mucking up the settings then returning to what I had done in HD500 edit ( in terms of feedback), however I still experienced the issue you detailed.

However, in both cases I had differing sync time settings. Now I dont know if the settings are 'exactly' the same in the 300, but with these parameters adjusted so they were the same, and contrary to your findings, I did achieve an even decay (though this caused the repeats to be in sync which essentially removes the sensation of the effect being stereo (though I believe it IS still stereo, but just stereo of the same thing)).

Then I changed the left and right sync to 1/4 (3) and 1/4 respectively, which returned me to the same position as I started, but when I swapped the sync settings (i.e. to 1/4 and and 1/4 (3) the longer/louder repeats switched sides!

I then scrolled though a variety of sync times and checked out the difference this made (other than to the sync time itself).

It may seem as though I am now stating the obvious, but as a result of all this I believe the number of repeats are directly linked to the amount of feedback (though perhaps with some variation dependant upon input levels etc, but for the sake of clarity the following is based upon the my settings YMMV). So for example, if I set L sync to whole and R sync to 64 with 50 feedback for both channels, with my input levels, Left will repeat around four times, but take four whole notes to decay, but R, whilst also repeating 4 times (or so is my belief based upon trying out a number of settings as I cannot actually distinguish the repeats at this setting) only takes 4/64ths.

So, my findings do seem to be in conflict with your own given our findings with 'symmetrical' settings, so perhaps you are experiencing a problem BUT I would emphasise that with differing sync times the trails do vary and need to be evened up with the feedback controls.

Perhaps if anyone else has a chance to check this you can get a more conclusive sample size (though I would say I am certain of the results I am getting).

Edit.

Having given this a little more thought. The variation available with the ping pong delay (spread and offset) should really cover you for the times you require something a little more balanced.... though I dont wish to detract from the possibility that you have a problem if your stereo delay is not balanced even when you have identical settings for each channel.