RZ1 was possibly the first sampling drum machine - certainly the
first affordable sampling drum machine.
It offered 12 x PCM samples but also had four pads into which you
could sample your own sounds which could be used as part of patterns.
Sampling quality wasn't good and sampling time was limited to just
a few seconds but it was useful for augmenting the ROM sounds.
I bought one when it was released in 1986 and I enjoyed using it
very much - the sounds were reasonable. It had pads for every sound
and sliders to balance the sounds in real time (although it also
had individual outputs for each sound and they benefitted from external
EQ and effects, etc.).