[A6] Stupid question regarding the arpeggiator.

[Demokid]

Hi!

I can't turn on the arpeggiator. When I press the arp button nothing 
happens, sometimes the LED "blink". When I select a present with arp turned 
on arpeggio works. I can turn off the arp by hitting the button but after 
that I can't turn it on again.
The button is not broken since I can turn off arpeggio. I can't turn on arp 
using the soft button 8 in arp config either. What I'm I doing wrong? I've 
read the manual hundred of times!

Regards
Demokid