Jack - There are on-line shruti sites such as karnATik which might suffice. Otherwise the best thing to do is track down a lite (cheap) version of Ableton Live for an effective soft-shruti. This is versatile looping technology into which you might export whatever samples you wish to use - even those of your rubab - and loop them in real time.

If Pip's got the Bontempi B1, then it doesn't have chord buttons at all which makes them all the more suited for Scottish music! These are similar in essence to the electric reed organs used on Christopher Hobbs's Aran (for reed organs and percussion) and MacCrimmon Will Never Return (for four electric reed organs) which feature on Ensemble Pieces - #2 in Eno's Obscure Series which, although very rare these day, with no CD release, can happily be downloaded gratis with full cover artwork & notes from HERE. Highly recommended for owners of electric reed organs and lovers of great & beautiful music. Aran I remember being used to great effect as crowd rousing intro music by Siouxie and the Banshees during their 1981 tour (with Linton Kwesi Johnson).

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Meanwhile, on the subject of cheap keyboards, reed organs and Instrument Acquisition Syndrome, Rachel's new lap-top size Indian harmonium (see below somewhere) arrived about an hour ago. She is at work today, I am working from home, now looking at this very inviting box sitting in the middle of our studio awaiting to divulge its hidden mysteries...