Operation of Handymig SIP welding unit

[Bob Douglas <b-douglas@ti.com>]

I've been loaned a light duty MIG welder to make some minor tailpipe repairs.
Problem is that there is no instruction manual and the owner can't remember
what the switches are for.  It's labeled Handymig SIP and appears to have been
made in Italy.  There are 4 controls: 
           1.  "On"/"Off" rocker switch (duh..)
           2.  What appears to be a wire seed control dial
           3.  "Maximum"/"Minimum" rocker switch
           4.  "1"/"2" rocker switch

Any ideas on the purpose and use of switches 3 and 4?

I plan to use it gasless.  Any advice on what wire to buy, welder set-up, and
use will be much appreciated.    

Thanks and regards,  Bob Douglas