ok nothing to do with sound ,,,,,
turbo 1 turbo 2 turbo 3 = amount of power and where in RPM it kicks in i.e
turbo 1 -8
turbo 2 -30
turbo 3 -100
basicaly this is wat it means:
RPM low = turbo = 8
RPM med = turbo = 30
RPM high = turbo = 100
there u can see it starting low building up and maxing at 100 in higher rpm
the higher the max is,,, the more the boost gauge reads i.e 0-2bar (28.6psi or sumthing)
if u go over 100, stragnly the boost works its way down again. i.e 123456789 10 987654321
and if u set turbo 1 to to a high number you get lag, so you have to get all numbers close enough to spool up cleanly,
the rx-7 LM racecar is known for lag up to mid rpm, cause its numbers are:
turbo 1 -8
turbo 2 -55
turbo 3 -105
takes lag to reach the 55 then it kicks in one big burst
turbo 4 turbo 5 turbo 6 , had no effect that i noticed on low and very high settings....
so that solves the case of turbo .