Question about Commodores "Rapid Fire"

[Funky Dude]

This song from the "Machine Gun" is a real synthesizer/funk/disco masterpiece with lots of synth. And I was wondering how did they create the effect that sounds like marbles or steel balls bouncing at rapid speed in a small container underwater and the "WOOOM WOOOM WOOOM" sound with an arp synthesizer?

[Blaxman]

Yes Funky, In fact that sound was made using a ARP-2600 synthesizer, the same synth was used by Kool & The Gang in "SUMMER MADNESS".

You can see the picture from a real ARP-2600 at "SENHORES DO GROOVE Website".

http://www.sgroove.hpg.ig.com.br/sgroove_instrum.htm

Peace.