Signal accumulator +=~ adds all the values it receives. The result can grow very large, very fast. Cycling '74 MSP (signal) Accumulator Input TEXT_HERE (signal) Accumulator Input TEXT_HERE (signal) Accumulator Output TEXT_HERE Initial value Sets the initial value for the sum. The default is 0. Reset the sum to 0 Resets the sum to 0. Set the stored value without triggering output The word set, followed by a number, sets the stored value to that number, without triggering output. Add input sample added to all previous samples Each sample of the input is added to all previous samples to produce a running sum. For instance, assuming the sum started at 0, an input signal consisting of 1, 1, 1, 1 would produce 1, 2, 3, 4 as an output signal. Each sample of the output is the sum of all previous input samples.