(report link) Audacity Free Audio Editor: Free, easy-to-use audio editor and recorder for Windows, Mac OS X, GNU/Linux, and other operating systems.
(report link) Cakewalk: The world’s leading developer of powerful and easy to use products for music creation and recording.
(report link) Chronotron Plug In: Deliver high-quality tempo and key modifications in real-time at any scaling ratio.
(report link) Electric Violin Shop: Solutions for amplifying bowed strings ...where electric violin, electric viola, electric cello and electric upright bass are our specialty!
(report link) Gootar Chords Generator: Tab generator and editor for 4 strings.
(report link) Notation Software: Discover how Notation can turn your computer into a delightful musical companion that plays along with you, helps you learn music, and makes it easy for you to notate and hear your own music.
(report link) Roni Music Amazing Slow Downer: The main product is the Amazing Slow Downer software, intended for musicians wanting to slow down music without changing the pitch. Amazing Slow Downer is available for Mac and Windows computers.
'Windsor Violin' 2 hrs
'How do I know?' 2 days