Yes this is apparently caused by the limited processor speed and power used in the PSR740. It uses the same CPU as the 730, whilst it managed that machine ok I reckon the 740 could do with something beefier. I've looked over the schematics for the 740 and although it may be possible to overclock the CPU, this might have some detrimental effect on other devices in the keyboard. I'll look into this and let you all know the outcome.

Simon