A predetermined sequence of events.
Each event needs a delivery time and channel. These can be entered as space delimited text in the format "time1 channel1 time2 channel2" etc with optional newlines after any pair. Alternatively, there is a dedicated user interface for creating sequences.
After entering a sequence as text, click the parse_text for it to take effect. The spikes will be sorted and the text display updated to reflect the correct sequence. That is, it is not necessary to enter them in the right order initially.