I acquired a Lachenal tutor EC about nine months ago, never having played anything like it before. I've been playing it for half an hour or so most days, mostly tunes with some song-accompaniment. My original plan when buying it was to use it mainly for song accompaniment, but I've got more and more into playing tunes on it; just recently, i.e. within the last couple of weeks, I've started playing a few tunes at speed, which in turn has led into practising more fiddly tunes like Speed The Plough.
I find the EC quite awkward to hold, especially the finger-troughs. I think I could support the whole thing with thumb-straps and one knee and not bother with them, but the thumb-straps aren't quite tight enough & I can't see any way to tighten them further.
Oh, and I'm 52; I've always had jobs which make heavy use of a keyboard, and have always suffered from stiff hands - nothing drastic, just that where somebody else might say "I'm worn out and my head/back/neck hurts" I'm more likely to say "I'm worn out and my hands are really stiff".
So that's the background to my tale of woe. The tale itself happened last night as I was lying in bed. I could feel various muscles jumping as my body relaxed; that often happens, and I didn't pay it any mind. Then a muscle started jumping in my left hand. The 'jumping' got stronger, till it was more like something was trying to twist my hand round and form a grip. A couple of fingers even moved a little (a quarter of an inch at most). Then it happened again. Then it died down... and then it started again. I could stop it happening by taking control of my hands, but as soon as I relaxed them (as you do when you're trying to sleep) back it came. It must have been half an hour before it stopped completely, and by then I was too freaked out to sleep.
I told my wife about it this morning; she looked at me and said "Concertina". What do people here think? And if it is fiddly-keywork-related muscle-cramp, what's the solution?