REAPER script for toggling playrate

playrate-toggle.lua

-- @description Master playrate - toggle between 1 and 2
-- @version 1.1
-- @author [email protected]
-- @changelog
--  + Modified to toggle between 1x and 2x speed
--  + Any other rate resets to 1x

local r = reaper
local rate = r.Master_GetPlayRate()

r.Undo_BeginBlock()

if rate == 1 then
  -- Currently at normal speed, switch to 2x
  r.CSurf_OnPlayRateChange(2)
elseif rate == 2 then
  -- Currently at 2x speed, switch back to 1x
  r.CSurf_OnPlayRateChange(1)
else
  -- Any other rate, reset to 1x (normal speed)
  r.CSurf_OnPlayRateChange(1)
end

r.Undo_EndBlock('Toggle master playrate (1x/2x)', 2)