Think they at least have the black keys. VINTAGE PLANET - Synthesizer Service & Parts
I think that 'Hold' button is the same as the ones used on Monopoly/Trident MK1 & MK2/X-911/CX-3 & BX3/Lambda vintage products (not sure about colour), so worth checking those too.
Korg Trident Mk1 - Oberheim OBXa - Roland SH-09 - Doepfer Dark Energy Mk1 - Nord Lead 2X - Waldorf Q - Access Virus B - Roland JD800 - Moog Minitaur - EDP Wasp (somewhere) - Creamware Minimax ASB - Roland JP8080 - Korg 168RC Sound-link - S/W: Reason & KLC
'Coming to grips with compromise is an essential ingredient for balance, harmony and avoidance of conflict'. Maisonvague