A square on a chess board, as well as a move or even opening pertaining to that square.
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Having played with sound recording gadgets for 30 years, I found the D4 is easy to use, with just the right amount of bells and whistles, when and where I need them most.
The D4 digital recorder provides four types of effect chains, in which up to five effects can be connected in a specified order.
Inside the D4 is a PCM sound generator that can produce 87 different rhythm patterns (32 metronome patterns and 55 rhythm patterns).
D4 is the original high-pressure load path laminate methodology introduced by Doyle Sailmakers in 2000.
Farr 40 OD and D4 This was achieved by creating a "radially constructed sail" whereby the fabric was cut into a series of panels, triangles and wedges and then joined to create a structure where the warp direction of the material approximately followed the load paths within the structure.
In the D4 sail, all yarns converge to the high load point in the corners of the sail, reducing the amount of fiber required to produce a stronger, smoother, lighter structure.