As I recall, no-one could make it work reliably and then Roland tech support confirmed that it doesn't work as intended. There's a thread about this in the archives somewhere.
TH
On Wed, Apr 23, 2008 at 7:26 AM, Scott Kellogg <bassnut@gmail.com> wrote:
I'm still not getting why a few people think the RC-50 is 'useless' as a clock slave.