Our Propeller Spin objects and Propeller C Libraries are offered under the MIT License.
Make some noise with this helpful guide on creating audio with Audacity that you can use with your Propeller C or Spin projects.
Formatting audio to be compatible with your Propeller C or Spin projects is simple with Audacity; just follow this guide for step-by-step instructions.
Air temperature plays a significant role in the speed that sound travels. This concept becomes very important when you measure distance or navigate your robot using ultrasonic sensors like the PING))). Check out this reference to learn how to calculate and compensate for these effects, and also to learn a bit more about why it happens.