I made the difficult decision to offload a whole lot of analog drum machines and synthesizers that I had collected over the years.

I now have:

ONE (1) monophonic analog synthesizer
ONE (1) polyphonic analog synthesizer
ONE (1) analog drum machine

Kemonophonic said:
I made the difficult decision to offload a whole lot of analog drum machines and synthesizers that I had collected over the years.

I now have:

ONE (1) monophonic analog synthesizer
ONE (1) polyphonic analog synthesizer
ONE (1) analog drum machine

I have a question, why do people do [number in full name] and then the number in between brackets?