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Found 3 results

  1. 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.
  2. In another thread: Boyd Wheatstone Concertinas BW77 mentions some experiments with muting the volume of selected reeds: I have tried a leather baffle on the LHS of my Peacock and while it reduced the volume it also changed the tone. Most of the time I don't use the baffle. Another problem is that it reduces the volume of all of the reeds on that side, whereas I only want to lower the volume of the lowest reeds. I tried 'feathering' the bass buttons with my fingers to see if I could get a decent volume reduction with a very slight button press, but there seems to be quite a cliff edge between sound and no sound so I am not sure if this technique will work for me. I might try some additional washers to see what happens - it is a simple, non-destructive experiment. Then BW77 mentions taping over the pad holes with 'quite interesting' results. Please elucidate. Is that interesting in a good way or a bad way?
  3. A few of the higher reeds on my 1914 Wheatstone English tenor-treble sound thin, with less volume than others. I suspect the instrument has been played a lot more in its middle and lower ranges than up high, so part of the difference might be a difference in how much playing-in the different reeds have undergone over the years. The feeble notes speak quite freely and start just as quickly as the others - they just produce a noticeably weaker sound. I have a later Wheatstone (1928) and that has a fairly consistent volume up the scale, which I'd like to achieve in the 1914 one. Is this possible? How can I turn up the volume a tad on those weaker notes? In some cases it's just one of the pair - so the draw speaks louder than the pull or vice-versa. Any guidance would be appreciated. Ray
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