Strange,
Many people swear that Roland manuals are worse..
Personally, I think the Roland manuals do the job quite well.

As to your vibrato problem, somehow you need to get the mod wheel to vary the amplitude of the volume section of the sound your editing.
It could be as simple as assigning the mod wheel to a LFO (low frequency oscilator).
Me not having a S08 synth does really help you, not having knowledge of synths isn't really help your self either.
Now if you had a Roland I might be able to help.