To change the tone or beat, interact with the flooring tile after the block is applied (i.e. Right Mouse).
By default, blocks are shown at 50% opacity; you can disable showing the blocks entirely or change the opacity in the config.
Technical
Requires SMAPI, uses Harmony.
Compatible with Mod Updater for automatic updates.
Implements a Generic Mod Config Menu interface to change config settings in-game.
Code is at https://github.com/aedenthorn/StardewValleyMods.
If you want to complain or ask for help or help me test my mods, you can visit my Discord server.
A list of all my mods for Stardew Valley is available at https://www.nexusmods.com/stardewvalley/articles/895.