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For a number of years now a friend on mine has been building an experimental electronic Anglo concertina. He has now arrived at a reasonable working prototype. One of the features of this concertina is volume modulation using a twin port differential pressure sensor. One port of the sensor is connected to the bellows enclosure and the other the outside world. The actual differential pressure variation measured in the bellows during playing proves to be quite small, that is, less than 3 kilo pascals. Finding affordable sensors with that low pressure range has proved difficult. However, using a Chinese manufactured CFSensor XGZP190 3kPa is currently under investigation. The has led me to think about other ways to measure this activity that do not involve pressure sensors. Fundamentally, the energy expended by the player in moving the bellows end plates is transferred to the reeds and converted into sound. The force being exerted on each end plate can be measured using a load cell sensor of some sort placed where the heel of the hand meets the end plate. This force will be divided equally between all the currently pressed buttons. If the additional force applied by fingertips holding buttons down can be ignored, then a simple calculation to provide a numeric value that is applied to all the “voices” currently playing can be made. if the hand grips were hinged at the top with limited movement at the bottom then push and pull could be differentiated as well as measured. Otherwise a differential pressure sensor may still be needed purely to detect pushing or pulling. My friend says that this may have to wait for a future version! Apologies if this has been tried before. But any comments will be appreciated.