Here's the group from EDIG's Oct 23, 2012 PR via doni that replied to the court Jan 28.

Suit 3 10/22/2012 ... . 7 defendants; ***** = retail...consolidated to suit 1 judge
License #... defendant # over all..... license #/ settlement# this suit......defendant # this suit

***** 57) ?/? 1) KORG U.S.A., Inc., complaint 737, 774, 170, 108 to  answer on 1-28-13 ... . 1-28-13 all defendants have answered complaint
***** 58) ?/? 2) KORG, Inc., 
***** 59) ?/? 3) Guitar Center, Inc., NOTICE of Appearance by Steven Brower on behalf of Guitar Center, Inc. ( Brower , Steven ) ( yeb ). (Entered: 11/17/2012)
***** 60) ?/? 4 ) J & R  Electronics Inc., 
***** 61) ?/? 5) Sam Ash Music Corporation, 
***** 62) ?/? 6) Sweetwater Sound Inc. 
***** 63) ?/? 7) Kraft Music Ltd., 
Per Plank... . KORG, Inc. has no parent company. The following publicly held companies own 10% or more of KORG, Inc.’s stock: Yamaha Corporation

Krog defendants simply answered..no counter complaints