Archive for the ‘inharmonic series’ Category

An Aeolian Day

Sunday, November 13th, 2016


DIY Electric Aeolian Harp
Brinno Timelapse camer
Movie Studio Platinum 13

For bowed gongs and golden ration tuned piano (and bonus track)

Thursday, August 13th, 2015

Music Studio

Bowed gongs and a piano tuned to a Golden ratio derived tuning (see below) and driven by Melodyne’s polyphonic interpretation of the gong track.

1/4 comma meantone tuned piano driven by the same gong derived score.

Golden tuning created and explained by Jake Freivald

Electric Aeolian Harp With Plate Suspended by Lead Weights

Tuesday, October 14th, 2014

This is a variation – I tried using the lead fishing weights to hold the plate in place which worked wonderfully. As a result the plate was no longer tied at one end to a bridge and could freely vibrate on the strings.


Click pictures to enlarge

14.5 minutes of wind event

Lee Street Beach (manipulated inharmonic series)

Saturday, September 13th, 2014

The sound is that of my aeolian harp modified with lead fishing weights and then manipulated in Sonar X3. Version 1 is in the video.

Version 1

Version 2

Fishing Weight Prepared Aeolian Harp (inharmonic series)

Friday, September 12th, 2014


This is a second variant of my prepared Aeolian Harp – using slit ball lead fishing weights I create a large inharmonicity in the strings. Guitarists will be familiar with the phenomenon of old corroded and / or dirty strings losing proper intonation. This is forcing the effect to an extreme. Each picture can be enlarged. This works well on guitars too. A gong like sound often results, though when rain hits hard on a string a bell like tone can be produced. I apologize for the hiss. My choice is to live with the hiss and not detract from the full sound and muffle the top end with noise reduction. And on that subject, the added weight here is concentrated and does not present a large surface area like the steel plate did. So this version was harder to be activated by wind and was quieter and required a larger volume boost.









Prepared Aeolian Harp – Steel Plate

Sunday, August 31st, 2014



The Prepared Aeolian Harp is going to be a series of modifications – like the 3rd bridge post. This modification was inspired by the harp picking up a tornado warning siren by sympathetic vibration. The reasoning here is that the steel plate offers more surface area and would be a more sensitive detector. To some extent this is correct. The harp has become very sensitive to foot steps even in the back of my home. (Those are just “thuds” and more from the large mass of the plate vs the pickups I suppose) and I saw and just heard in one spectral view a car motor. Since this is new there needs to be some optimization. The current file displayed here is almost entirely due to wind – on a day with very light (<5 mph) breezes coming from over my home to the back of the harp - the worst possible angle. So I am looking forward to the experience of having a windy day and a more favorable wind direction. Even at these mediocre conditions the harp pickups can be easily overloaded and I am recording with compression on (applied after this recording) to prevent spikes. The plate is about 6" x 18" and 32nd" and is mounted by weaving the plate into the existing strings.