Kabinopus,

Using a volume pedal assigned to RH only, really adds to lead-line expressiveness, especially with sounds that increase in volume after the initial attack, such as Sax, Strings, Horns, and, most importantly, Organ. Pretty much a necessity, in my opinion, especially for instrumental music, but also vital when singing, as it lets you change RH volume without affecting the steady level of the accompaniment. Really handy when doing solos and/or playing licks behind the vocal.

I use a Yamaha FC-7 Expression Pedal...well made, smooth, and adjustable for standing or sitting, and very easy to set up.

Definitely a good investment as it can be used with a newer instrument, should you ever upgrade.

Ian