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Convert BPM (beats-per-minute) to millisecond.

Add this line to your application's Gemfile:

gem 'miserable'

And then execute:

$ bundle

Or install it yourself as:

$ gem install miserable

require 'miserable'

bpm2ms = Miserable.new(120)
puts bpm2ms.quarter_note #=> 500.0
puts bpm2ms.eighth_note #=> 250.0

1. Fork it ( https://github.com/5t111111/miserable/fork )
2. Create your feature branch (git checkout -b my-new-feature)
3. Commit your changes (git commit -am 'Add some feature')
4. Push to the branch (git push origin my-new-feature)
5. Create a new Pull Request