Add script for changing items' volume linearly

Utilities/MB_Change selected items' volume linearly from earliest item volume to entered target volume.lua

@@ -0,0 +1,46 @@
+-- @noindex
+
+reaper.Undo_BeginBlock()
+reaper.PreventUIRefresh(1)
+
+local num_selected_items, retval, target_volume_str, target_volume, first_item, last_item, first_item_vol, last_item_vol, first_item_pos, last_item_pos, slope
+
+num_selected_items = reaper.CountSelectedMediaItems(0)
+
+if num_selected_items < 2 then 
+  return 
+end
+
+retval, target_volume_str = reaper.GetUserInputs("Set Volume", 1, "Target Volume for Last Item (dB):", "")
+
+if not retval then 
+  return 
+end
+
+target_volume = tonumber(target_volume_str)
+
+if target_volume == nil then 
+  return 
+end
+
+first_item = reaper.GetSelectedMediaItem(0, 0)
+last_item = reaper.GetSelectedMediaItem(0, num_selected_items - 1)
+first_item_vol = reaper.GetMediaItemInfo_Value(first_item, "D_VOL")
+last_item_vol = 10 ^ (target_volume / 20)
+first_item_pos = reaper.GetMediaItemInfo_Value(first_item, "D_POSITION")
+last_item_pos = reaper.GetMediaItemInfo_Value(last_item, "D_POSITION")
+slope = (last_item_vol - first_item_vol) / (last_item_pos - first_item_pos)
+
+for i = 0, num_selected_items - 1 do
+  local item, item_pos, new_vol
+
+  item = reaper.GetSelectedMediaItem(0, i)
+  item_pos = reaper.GetMediaItemInfo_Value(item, "D_POSITION")
+  new_vol = first_item_vol + slope * (item_pos - first_item_pos)
+
+  reaper.SetMediaItemInfo_Value(item, "D_VOL", new_vol)
+end
+
+reaper.UpdateTimeline()
+reaper.PreventUIRefresh(-1)
+reaper.Undo_EndBlock("MB_Change selected items' volume linearly from earliest item volume to entered target volume", -1)

Utilities/MB_Select child (descendent) track(s) & deselect selected parent folder track(s).lua

@@ -1,8 +1,9 @@
 -- @description MB_Utilities: Various utility scripts for Reaper
 -- @author MonkeyBars
--- @version 1.4.2
--- @changelog Make edit highest marker script work when only 1 marker
+-- @version 1.5
+-- @changelog Add script for changing items' volume linearly
 -- @provides [main] .
+--   [main] MB_Change selected items' volume linearly from earliest item volume to entered target volume.lua
 --   [main] MB_Create new autoincremented folder and save project.lua
 --   [main] MB_Create new pair of grouped tracks with MIDI & stereo audio routing to & from selected (virtual instrument) tracks.lua
 --   [main] MB_Deselect tracks if child track(s) & select their direct parent folder track(s).lua