Read the current state of a playing pattern.
@note For mk2 devices only.
@param dev blink1 device to command
@param playing pointer to play/stop boolean
@param playstart pointer to start position
@param playend pointer to end position
@param playcount pointer to count left
@param playpos pointer to play position
@return -1 on error, 0 on success
Read the current state of a playing pattern. @note For mk2 devices only. @param dev blink1 device to command @param playing pointer to play/stop boolean @param playstart pointer to start position @param playend pointer to end position @param playcount pointer to count left @param playpos pointer to play position @return -1 on error, 0 on success