The OAS Technology Upgrade Project
The MIDI facilities offered by OAS-7 are extensive and comprehensive, yet to the
novice they may seem difficult to experiment with unless there is an expert on hand
to offer advice and help. At least, that’s how it has seemed to me yet I’ve been
concerned that all those facilities have been sitting in my Verona for eleven years,
untouched. Now we have an opportunity to investigate that MIDI section without concern
because Jeff Ormerod has been working on a project which has been very successful
and he wishes to share his results with all of us.
Jeff is an electronics expert and with his guidance I can’t wait to get started on
this project. He has produced a guide which you can download as pdf files from the
links below. If you have any questions for Jeff after reading his guide, do send
them in using our usual ‘Contact’ e-mail address. I’ll forward them to Jeff and send
his responses back to you. If we can achieve a good dialogue like that I shall set
up a new page on this site dedicated specifically to the project and include all
correspondence on that page.
Here is Jeff’s description of his project:
As the owner of a Wersi instrument, have you ever asked yourself these questions:-
How can I improve the authenticity of the instrumental sounds?
Wersi OAS/X organs use a relatively small set of generic instrumental samples to
synthesise a larger range of variants and articulations. It’s an artificial process
that works well, but it’s not the real thing.
What if your instrumental sounds were individually sampled in the highest audio quality
from world class orchestras using professional musicians to play all the styles,
nuances and articulations that each instrument is capable of producing. What if these
instruments were also sampled in a variety of different ensembles within the orchestra
such that you could play individual sections, combinations of sections or even the
entire orchestra in the most realistic way possible. What if these instruments were
sampled using a number of different adjustable microphone positions so that you could
obtain exactly the right tonal balance. What if the ambience of the environment in
which these instruments were sampled was also captured so that you could add varying
degrees of really authentic reverberation.
How can I expand the versatility of the organ?
Wersi take what is essentially a general purpose computer based MIDI system and customise
this into a musical instrument by using the OAS/X applications software. There is
no opportunity to change or enhance the facilities provided by this, you have to
have what you’re given.
What if you could easily add a whole host of new playing features and customise these
to your own particular requirements and preferences.
How can I use the most up to date technology in the organ?
By producing a specific variant of a computer based MIDI system, Wersi have locked
the architecture of its OAS/X instruments to a particular legacy technology. So the
migration to a more advanced technology would require a complete redesign of the
What if you were able to incorporate the very latest state of the art sound processing
technology in the organ, with a level of flexibility that would enable it to keep
pace with all future technological developments and so ensure that the instrument
would never become out of date.
Well for the first time ever on a Wersi instrument you can have all of this and much
The following articles detail all the information necessary to upgrade any OAS instrument
to a level of technology way beyond that obtainable on any OAS/X instrument. So now
you can have the best of both worlds, a state of the art instrument offering all
the features and facilities of a standard OAS organ, but significantly enhanced in
quality, authenticity, versatility and future-proofing by the very latest in music
2. Setting up the Wersi MIDI and Audio System [NB: 20 Sep 2016. This section has
now been updated. See information below*]
3. Installing and Testing the Hardware
4. Installing and Configuring Kontakt
5. Installing and Configuring Hauptwerk
*Update on Section 2 from Jeff:
Following Bill's suggestion, I've re-mapped the MIDI channel assignments for the
Accompaniment Unit so that channel 10 is now not used, and ACC4 & 5 now have separate
channel numbers. I've also added a comment relating to the fact that if the MIDI
sequencer is to be used concurrently with the manuals and/or the Accompaniment Unit,
then we need a second MIDI port to provide the additional 16 channels required.