Big plugs in TR-250 floor pans - why?

[Skip Montanaro <skip@mojam.com>]

My TR-250 has two large rubber plugs in the floor pans.  I presume 4's and
6's have them as well.  What are the holes they plug used for?  The only
things that come to my mind are letting water out and/or letting water in.

Thanks,

Skip Montanaro  | Mojam: "Uniting the World of Music" http://www.mojam.com/
skip@mojam.com  | Musi-Cal: http://www.musi-cal.com/
518-372-5583