Analogue systems

Hello group.  I am looking for some help with an LFO problem I 
have.  I want to trigger an LFO with a note on signal so that the 
LFO is started from the same point every time.  This is easy on a 
digital synth (just set "Note On Trig" to ON).  I have the RS 8000 
system.  Any ideas?

Alex