Double Tape Pulse Keyword
MDSP bit 400 modifier, the bit that makes a tape pulse need to be double. Reset if N = 0, otherwise set. All MDSP modifiers are both parameters and switches. If N is missing the bit is set and the mode is active. Short form used to be <dtp> however that keyword is needed elsewhere.
In the bad old days of acoustic stimuli having to come off tape for cross modal experiments false triggers were catastrophic so this mode was added that required a tape pulse to be followed by another 200ms later (+ or - 10ms) in order to be valid.
If a polled input device (see Input below) is being used then you may want to reduce the default polling rate from 10ms.