Most electronic equipment uses the principle of amplification. You need filters, modulators and mixing equipment which have gain stages. By piling these components up, I was able to work without any sound generators and I made several pieces in that manner.
![Most electronic equipment uses the principle of amplification. You need filters, modulators and mixing equipment which have gain stages. By piling these components up, I was able to work without any sound generators and](http://cdn.quoteddaily.com/images/david-tudor/most-electronic-equipment-uses-the-principle-of-amplification-you-need-filters-modulators-and-mixing-equipment-which-have-gain-stages-by.jpg)