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Already did that, but the patches weren't active while cycling through them. Maybe I'm doing something wrong?

I have had the exact problem as two other posters, namely running the amp sims causes the appearance of the high pitched noise. It disappears if I turn off the cabinet sim or if I get rid of the amp sim completely.
It's there whether I'm on battery or mains power.
Just following up on this. What do you mean the patches weren't active? You were in the mode where pressing the footswitch cycled through each of your A/B/C patches, and you were able to switch to each patch with the footswitch but your sound wasn't changing?
I've tried two units now. Both have identical high pitched noise problems. The serial numbers were #721 and #1039. What's the serial number of your unit Peter? Just wondering if there is any correlation...
Something to consider: we've got a wide range of users, with different types of basses, and different needs in terms of gain. One person may be using the SVT sim with the gain at 1/3, and someone else with it racked.
It would be helpful for people to mention the settings they were using, as well as the patch name, when they experience the noise.
Serial #508.

Errr.... this is interesting. I also have serial # 000508.
Errr.... this is interesting. I also have serial # 000508.
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For what it's worth, I didn't like the phaser that much, so my MXR Phase 90 is for keeps. The delay and the tremolo are great.