-- MIDI Grid: pitch down one scale degree (pass-through when grid mode is off)
local dir = ({ reaper.get_action_context() })[2]:match("@?(.*[\\/])")
local G = dofile(dir .. "midigrid_lib.lua")

if not G.isActive() then G.passThrough("_OSARA_LOWERNOTEINCHORD") return end

local hwnd, take, err = G.editor()
if not take then G.say(err) return end

local p = G.scaleStep(G.getPitch(hwnd), -1)
if not p then G.say("bottom") return end
G.setPitch(hwnd, p)

local ppqA, ppqB = G.cellPPQ(take)
local on = G.noteInCell(take, p, ppqA, ppqB) ~= nil
G.say(G.noteName(p) .. (on and ", on" or ""))
G.preview({ p })