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20 September 2016

Bill Gray has previously provided articles on MIDI which are very informative and useful. Links to these articles are repeated here for their useful information.

(Wersi Specific MIDI information)

(General MIDI information)






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 instrument.


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 more!


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 processing technology.


PDF Files:


1. Introduction


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


Happy experimenting.




September 2016


*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.