Direct Stream Digital product logo
Sony and Philips.
Vector logo extracted from <a rel="nofollow" class="external free" href="http://www.korg.com/uploads/Support/MR1000_OM_E2_633656447565930000.pdf">http://www.korg.com/uploads/Support/MR1000_OM_E2_633656447565930000.pdf</a>