Programming a Roland TB-303 - Part 1 - Setting up

Programming a TB 303 can still sometimes be confusing and if you don't use it often, you can easily forget the details.
So I thought I'd add my 2 cents on how to program this silver box.

Setting up the TB-303

Before you begin anything, to need to decide if you are writing a track or a pattern.
A pattern is the basic sequencing unit. It can have up to 16 steps.
(In the manual patterns are also called measures).
You can create longer sequences by chaining patterns.
A track is like a song. It's a collection or chain of patterns

The Mode Switch  (on the right) has 4 settings.
1. Track Write
2. Track Play
3. Pattern Play
4. Pattern Write

The Track Patt.Group Switch on the left has 7 settings.
The tracks are highlighted in black.
It lets you choose:
1. one of the 7 tracks
2. one of the 4 pattern memories (I, II, III, IV).
     It's a bit confusing as there are 7 poles to the switch.
     Memory I = 1, 2.      Memory II = 3, 4.      Memory III = 5,6.     Memory IV = 7.
     Each of the four pattern memories are further divided into parts A & B
     Each part is again divided into 8 cells.
     In total, there are places for 64 patterns.

The 303 uses non-volatile memory.
In order to save any patterns when the 303 is turned off you need to insert batteries.
You can keep the batteries in the housing, even when using a AC adaptor.
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I'll update these notes over time.
Do let me know if there are any mistakes, or omissions.
Cheers jono