Version OS 1.0
11 The Sequencer
The Alpha Base has a step sequencer that is able to program rhythm patterns in the
style of vintage Roland TR-X0X drum machines.
The sequencer has two basic modes:
The first mode is the classic drum triggering via 16 steps per measure with possible
accent per step or not. Each instrument can be edited in real time while the rhythm
pattern is playing, but the rhythm just triggers the instruments like a drum stick.
The second mode is also able to play back the pitch of each instrument plus an optional
so-called parameter-lock (p-lock) per step. This is activated with the button SEQ = on.
We call it sequence mode. In sequence mode, the p-locks play back parameter changes
like Midi CCs. P-locks can be, for example, changes of filter cutoff, LFOs or sample
selects.
In sequence mode, the sounds can still be edited in real time but, for instance, the pitch
may change or the p-locks override an edit just made.
11.1 Selecting Patterns
11.1.1 Pattern Recall
If the EDIT/TRIG LED is off, the (Step) buttons serve for selecting 16 patterns in a
bank.
11.1.2 Bank button
A maximum of 64 patterns are storable in memory organized in 4 banks with 16
patterns each. You can switch between the banks by pressing the (Bank) button. The
currently selected bank is shown by the respective (Bank LED) 1-4.
Pattern as bank changes can be performed whilst the sequencer is running. The
changes take effect immediately, without waiting for wrap-around to the new pattern.
86 ALPHA BASE Operating Manual
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