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  Expression Pedal & Crossfade Feature

By Ken Belton

The "Crossfade" feature was first incorporated into the OAS system with Version 5.

A very useful feature particularly when playing orchestral combinations.  "Crossfade" does not operate with the OX7 drawbars or the Wersi drawbars.  Basically it is for use with the long wave sounds.  However it can also be used with some imported Akai samples.

Chapter 7-5 of the users manual gives us an example of  how "Crossfade" works. The example shows how to use Crossfade by using the settings at their most extreme to demonstrate how it works. Perhaps  we could use the example here to clarify the point - i.e.

First put a piano sound on Upper 1 and strings on Upper 2, then set the volumes of both at an equal level.  Then go to the "selectors advanced screen" and set the "exp. pedal" values to 100 on Upper 1, and -100 on Upper 2.  By using the expression pedal in the back or off position we will have the "Strings" sound" only and no Piano. Moving the expression pedal forwards the Piano becomes the dominant sound and the "Strings" fade.  From this example it can be appreciated that this feature has much potential.  Another example could be using the same setting to alternate two lead instruments e.g. "Saxophone" on Upper 1 and Trumpet on Upper 2.

My own use of the Crossfade, in the main, is to use it in an orchestral sense to maximise the use of a single preset.  The volumes are adjusted so that the lead instrument is still just heard when the pedal is fully forward.

Crossfade method used to create the Total Preset for "Stardust" / "Deep Purple" etc.

The descriptive and downloadable preset that you will find on the total preset pages, uses a Miller style of big band sound.

With the use of the "Crossfade" I use Upper 1 as a lead instrument, in this case it is the "Alto Sax MF." Maximum clarity of this instrument is achieved with the expression pedal in the reverse position. On Upper 2 there is a "Sax Section Loose" sound.  Moving the pedal forward increases this deep sound, but the "Sax" sound on Upper 1 can still be heard.  On Upper 3 "Sax Sect.1" is used. This I use with "Wersichord" set to "Big Band Reeds" to achieve the "Miller" effect sound. 

The settings for the expression pedal on the "Advanced Selectors" page are now set to -20 on Upper 1, 70 on Upper 2, and 100 (std) on Upper 3.  With the volumes adjusted as per the example,  moving the expression pedal to the full forward position the Upper 3 sound is not distinctly heard until "Wersichord" is applied to it. To appreciate this sound fully the octave needs to be shifted to +1.

To help with the orchestra there is "Horn Section Swell" on Lower 1 and "Clarinet 2" on Lower 2.  The expression pedal values have also been modified to help  balance the manuals. Lower 1 80 and Lower 2 at 50.  Also it will require the "Offset" value in the "Advanced ACC" screen to be altered from it's default setting of "0" to about "50" otherwise no sound will be heard from the bass pedals if used.

The changes in sound achieved by using Crossfade in the case of  this preset are far more subtle than in the previous examples mentioned, but by using the expression pedal to vary from the lead instrument to the heavier Sax sound of Upper 2 through the full reed sound when Wersichord is applied to Upper 3. a pleasing  big band sound can be achieved just by using one preset.

For me the Crossfade was a very worthy inclusion to the OAS system and I would have to admit the method described above is usually applied to most of my presets.

Even if you do not use the "Crossfade" very often it is perhaps worth finding a vacant preset or two to explore the full potential of this great feature.

Total Preset for "Stardust-Deep purple"




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