I use one regularly, and have never noticed any hiss at all!
As for the four outputs, you can set the heads to independent speakers, which I did here: http://uk.youtube.com/watch?v=gy-SVV8b3QI
2008/12/29 van Sinn <firstname.lastname@example.org>radio radio wrote:Can't comment on the hiss, as I don't have one ;)
I have 2 questions for anyone with experience with the headrush:
(1) hiss? I've read some reviews that the hiss can be bad. My setup is mildly prone to hiss as is (and I typically take things out because hiss does bother me).
(2) the 4 output function...
If no cables are inserted into those outs, all four echo taps (i.e. like tape echo heads) are mixed onto the combined out.
Cables inserted into one or more of the head outs will carry that head tap, and it will be removed form the mix out.
This also means you can just insert a dummy jack into a head out to remove it from the mix.
In the mix out you could then have i.e. 1, 2, no-3, 4.
The 'manual' is downloadable from akaipro.com (maybe akai-pro.com).
Kayla's website: http://www.kaylakavanagh.com
Kaleidoscope Web Design: http://www.kaleidoscope-design.co.uk