Thank you prom! I'm assuming that the arp!0.touchosc file also goes into the Effects folder?
And no, you can't assume anything with this novice.
REAPER v6.11/x64
Windows 10 Home v1809
ASUS X99-A Motherboard / Crystal Sound 2 audio
Intel Core i7-5820K Haswell-E 6-Core 3.30 GHz
32GB RAM
Behringer U-Phoria UM2