Hello! Quick question here, do yamaha dx7's (mk1) naturally have clicking noises at high attack rates? Just bought one and am unsure if this is an issue or not. thanks!

Hello, I am new to the synthesizing world (especially new to fm synthesis) and just recently bought a used Yamaha DX7 mk.1 that's in great shape. However, I noticed a clicking noise in the attack and release of the keys (esp. on the lower end of the keyboard) for patches with short sustain (the same...