Bernie, this is a great topic.

I rarely use a sound in the left hand anymore...the exception would be a swing style, where I would put a piano sound in my left hand.

I found that a lot of the sustaining type sounds, such as strings (actually, especially strings) were a bit dense sounding and muddy, unless I was voicing my chords openly (notes far apart), which isn't always convenient.

Most times, all that is needed is to raise the volume of the pad voice in the factory style, as that style part is usually voiced properly for that kind of use...generally using one to three notes that sustain or are held. To try and play those notes in the left hand using a LH voice quite often interferes with how the instrument reads the chord.

Most, if not all, of the styles I use are edited versions done by me...and, they are assembled with the intention that I don't require the use of a left hand sound. They usually have new Pad parts and sometimes new Phrase parts...I have a small but very useful selection of donor styles I take parts from.

So, ultimately my answer to your question would be mostly no, with the exception as stated above.

Ian