Per the V3 manual, at 0 dBFS on the V3 the analog outputs produce a +25 dBu balanced signal. But if I recall the modSBM-1 takes an unbalanced signal, so by unbalancing it'll drop down to +19 dBu. However, I don't recall whether the modSBM-1 takes a pro (+4 dBu) or consumer (-7.8 dBu, or -10 dBV) line level.
If the modSBM-1 takes a pro line level (+4 dBu), then you'll need ~15 dBu attenuator (19 dBu - 4 dBu).
If it takes a consumer line level (-7.8 dBu), then you'll need ~27 dBu attenuator (19 dBu - (-7.8 dBu)).
I think. Hopefully someone who's stronger than me technically can confirm or clarify.
thanks brian, I couldnt find my v3 manual right away
I think todd said the sbm1 takes a pro-line at +4dbu, so that would mean a 15 attenuator, well, I have never seen a -15 db attenuator, so either 10 or 20 is gonna have to work, and If i recall, the sbm1 doesnt technically add 'gain' its really just an attenuator itself, ala the v2 trim, so if i get a 20 db pad, i may not have enuf juice, correct, and if i had a 10db attenuator i could run the sbm1 at 5, correct?
Im a bit confused to be honest