Hi Scott,
Operating System on MicroArranger is PA50, but it is brand new wheras PA500 has been around for at least 2 maybe even 3 years.
There again microarranger manual doesn't mention SDHC either, yet they work??
Quote
"Data storage 8MB (>20MB equivalent) Internal Solid State Disk (SSD), SD/MMC card slot."
Plot Thickens.
My Korg microARRANGER is essentially a Pa50,
which is older than the Pa500.
My Sandisk brand 8 GB SDHC Card works great with my Korg microARRANGER
so I would expect it would work on the Pa500 as well.
I was advised that formatting the SD/SDHC card on the keyboard itself critically important.
I was also recommended to purchase Sandisk to assure compatability.
Scott