AdrianFreed's blog

You got to walk that G Chord up the neck with Mississippi John Hurt

Watch the beginning of this arrangement of "You got to walk that lonesome valley" to see how the picking pattern is modified to match the left hand

The left hand is building up and breaking down parts of the G Chord.

This continues throughout the arrangement as the  first position G Chord shape is slid up and down the neck.

G Major

Plain Barre Chord in Open Tunings illustrated by Son House

The only fretted chords in this classic Son House bottleneck blues are barres with a 7th added on the high string.

G Major
C Major
D Major


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Freed Family 2009

College of Marin, California

Arduino sketch for high frequency precision sine wave tone sound synthesis

This table-based digital audio oscillator implementation illustrates a few useful techniques on 8-bit microprocessors such as the Atmel parts supported by the Arduino/Wiring IDE. A timer is used to establish the sample rate clock and PWM is used to output an 8-bit signal. Human hearing has impressive frequency precision so accumulation is done on 32-bit integers. The code is a lesson in how to used fixed point representations and careful sizing of tables as powers of 2. This reduces the computational cost of the inner loop of the oscillator to a single 8-bit multiply, table lookup and
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