Personally I never use a volume pedal with an arranger.
Last time I did was on my Hammond B3..back in the 1960's.....
after that I always used a Morley vol Pedal on a few keyboards until arranger Kbs were introduced..
http://www.morleypedals.com/tag/volume-pedals/ That's what I thought; I noticed that many arranger players do not use expression on the auto accompaniment parts. Why is that? Why do you not use expression yourself?
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"You Shall Know the Truth, and the Truth will set you free." John 8:32