HMD Change Technology offers music lessons and technology support. Originally started in the winter of 2002 and became an LLC in the summer of 2005.

• Learn about guitar lessons in the West County St. Louis, Missouri area. Hosts lots of guitar related information, widgets, Gadgets, and PDFs. walzguitar.com

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• HVAC software with over 1500 searchable solutions from the field as well as the ability to record your own solutions. Best suited for contractors and shop personnel who troubleshoot. Get answers to stubborn HVAC problems. HVAC Answer

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• The Teacher Advantage closed in May 2008. The web application is being reworked for a single educator user in which lesson plans can be posted online in a blog style. This reworked version will be freely available and will be used on this site. Beta testing here.

Kyle Walz (view resume) is the music teacher and maintainer of the above sites. Address and phone information is at the top of the page.