Module: Rampi::Helpers

Included in:
DSL
Defined in:
lib/rampi/helpers.rb

Instance Method Summary collapse

Instance Method Details

#expe(value, len = 16) ⇒ Object

Exponential envelope



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# File 'lib/rampi/helpers.rb', line 13

def expe(value, len=16)
  dur = len2dur(len)
  1 - pow((v1 % dur) / dur, value)
end

#invexpe(value, len = 16) ⇒ Object

Inverse exponential envelope



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# File 'lib/rampi/helpers.rb', line 19

def invexpe(value, len=16)
  dur = len2dur(len)
  pow((v1 % dur) / dur, value)
end

#len2dur(note_length) ⇒ Object

Converts note_length to ramp duration

Examples:

len2dur(16) #=> 1000

len2dur(8) #=> 2000



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# File 'lib/rampi/helpers.rb', line 29

def len2dur(note_length)
  2 * 8000 / note_length
end

#step(value, len = 16) ⇒ Object

Step counter By default, len is 1000 = semiquaver



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# File 'lib/rampi/helpers.rb', line 8

def step(value, len=16)
  (v1 / len2dur(len)) % value
end