hi there,

i have just bought a boss odb-3. whenever it is on, there is a very loud hissing noise. you cannot hear it when playing, but when it is on and there is no signal going through it, it is def there.

i have played with the settings and i cannot get rid of the hiss.

is this normal?
Ibanez BTB400QM
Vester Telecaster

Fender Rumble 60
Vox VT30

Boss DS-2
Electro Harmonix Holy Grail
Crybaby Original
Digitech Whammy
MXR 10 band EQ

soon to expand collection......

probably normal. overdrives boost the signal, so any normally quiet hiss will be more prominent
Get off this damn forum and play your damn guitar.
haven't you noticed that on your DS-2 as well? Seems to me that distortions buzz and overdrives hiss, and yes, it is normal
Rig Winter 2017:

Fender Jazzmaster/Yamaha SG1000
Boss TU-3, DS-2, CS-3, EHX small stone, Danelectro delay
Laney VC30-112 with G12H30 speaker, or Session Rockette 30 for smaller gigs
Elixir Nanoweb 11-49 strings, Dunlop Jazz III XL picks
Shure SM57 mic in front of the amp