Roland 808 Drum Machine

Project structure follows the Go naming conventions defined here: https://github.com/golang-standards/project-layout

Assets

Sound files were sourced from http://smd-records.com/tr808/?page_id=14 They contain samples of an original TR-808 in WAVE format. No license information was given.

Patterns were sourced from http://www.ethanhein.com/wp/2010/drum-machine-programming for the following beats

• Generic Rock
• Generic Hip-Hop
• The Funky Drummer
• Impeach the President
• When the Levee Breaks
• Cold Sweat

Formatting and Linting

The project is formatted using gofmt with the command go fmt ./... at the project root.

Note to windows users: Administrator privileges are required to run this command.

Configuration

Configuration is stored in the conf.toml file.

The [song_beat.pattern] section contains a binary representation of a song beat. Listed below is the key to the patterns for each type of beat.

• bd: bass drum or kick drum
• sn: snare drum
• hh: closed hi-hat
• oh: open hi-hat
• rd: ride cymbal

Running the Application from Source

Extract all the files from the archive into GOPATH/src. The root folder of the application on my local machine looks like this:

C:\Users\tflanagan\go\src\github.com\thrashy\drum-machine-808

From the root of the application run the following commands:

• go get -u github.com/faiface/beep
• go get -u github.com/manifoldco/promptui
• go get -u github.com/pelletier/go-toml
• go get -u github.com/google/go-cmp/cmp
• go get -u github.com/hajimehoshi/oto - Dependency of beep
• dep ensure - Vendor in the dependencies
• cd main
• go build -o drum-machine-808.exe - exe extension for Windows
• ./drum-machine-808.exe

Built With

• Beep - Sound player for Go
• Promptui - Interactive prompt for a better console user experience.
• go-toml - Go library for the TOML format.

Sample Input/Output