are u sure u are using a version of ugly vsti that supports acting as a rewire slave? i think that ugly was originally meant to be used in combination with the re:Fuse application and requires it .. after some digging i found that rewire slave support was a new feature added in 2005.. (see this thread:
http://macos9lives.com/smforum/index.php?topic=1370.0) as noted the file versionw ould have to be after 09-16-2005 and even stil.. we are not sure if the os9 version was updated to include this... but u could easily email leigh marble and ask him.. hes a pretty cool guy.. ive spoken to him a few times over email.
either way theres a reason the audio is "Dissappearing in the rewire world" therse usually a reason why.. i just wish that the original developers would better document but the world of software is so dynamic that sometimes the original authors themselves cant imagine every possible way that people will try to use it even!
lets revisit the list of rewire apps circa 2003
http://web.archive.org/web/20031004020509/http://www.propellerheads.se/products/rewire/products.htmlaccording to this chart.. studio vision is a host/mixer rewire application.
i think your problem may be that you are using two of the same type of rewire apps
rather then a host with a slave that connect together properly.
try using an app that is listed as being specifically able to be a "synth application" (slave)
rather then a "mixer application" (host) to connect to SVP.
notice that ableton live (and a few others) can operate as both.
honestly i have to say that ableton live probably might be the only application that u can rewire into SVP that can host VSTI..
MAX/MSP for MacOS is listed as a synth app (slave)
also worth noting is that SVP + Vision DSP do not support "Rewire 2" but only "Rewire 1" so you would definately need to use external MIDI or IAC as the rewire protocol wouldnt be able to handle MIDI communication directly to whatever slave app via the rewire connection itself.
i would try to experiment using Rebirth or Reason and get those working via ReWire into SVP first. Rebirth would be good for testing.
maybe you or someone else could write a more clear guide.