Update USERMANUAL.md

I removed the line as tweaking other parameters is just as effective

Author: Dougal-s

usermanual/USERMANUAL.md

@@ -108,8 +108,6 @@ From left to right:
 * **Late Delay Seed** - rng seed randomizing the late reverberations modulated delay's delay length, mod depth and mod rate.
 * **Late Diffusion Seed** - rng seed randomizing allpass delay, mod depth and mod rate in the late reverberations allpass diffuser.
 
-**Tip**: if there are any resonances generated by a particular part of the reverb, it can be useful to try messing around with the seed.
-
 ## Misc Controls
 
 ### Interpolate