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All PS/Tk function names begin with tk/ or tk- (or ttk/ and ttk- for the few Ttk-specific functions). The doc directory in the PS/Tk GitHub repo unfortunately has not been updated since this convention was adopted. One example from the docs is start-tk which is now tk-start.
Ideally, something like gtkTtk that has GTK do the actual drawing would be integrated into Tcl/Tk and become the default on Linux. In the meantime, there are third party themes that imitate the look and feel of the most popular GTK and Qt themes. I use MATE with the Arc GTK theme, so I went with the Arc theme. There was even a Debian package for it (sudo apt install tcl-ttkthemes). We can then apply the theme system wide (echo '*TkTheme: arc' | xrdb -merge -), so that all Tk apps such as git-gui also inherit the theme. It is probably better to give your Linux users instructions on how to install their own theme instead of hard coding one with ttk/set-theme, so they can choose one that matches their system theme (KDE users might pick Breeze while Ubuntu users might opt for Yaru). The screenshots in this tutorial use the Arc theme.
Let's extend the function that returns our labeled spin box to bind a validation function to the FocusOut event on the spin box. The spin box does have a validatecommand option, but I wasn't able to get it working. I looked through the examples that have come with the various variations of PS/Tk and couldn't find a single example of a spin box with a validatecommand. I even looked at the source code for Bintracker, a chiptune audio workstation written in Chicken Scheme with a PS/Tk GUI and developed by the current maintainer of the PS/Tk egg. Even it binds a validate-new-value function to the Return and FocusOut events of the spin box rather than using validatecommand.
The Allegro egg is accompanied by a couple of examples but no examples showing the use of the audio addon. The Allegro library itself comes with an example showing how to generate a saw wave, but being a C library, the example is, of course, in C. I ported that example to Scheme. I would have contributed the example back to the Allegro egg, but the repo is marked as "archived by the owner" and read-only on GitHub. I've included the example in the repo alongside the rest of the code for this tutorial in case someone finds it useful.
The Allegro egg is accompanied by a couple of examples but no examples showing the use of the audio addon. The Allegro library itself comes with an example showing how to generate a saw wave, but being a C library, the example is, of course, in C. I ported that example to Scheme. I would have contributed the example back to the Allegro egg, but the repo is marked as "archived by the owner" and read-only on GitHub. I've included the example in the repo alongside the rest of the code for this tutorial in case someone finds it useful.