Hello Michael,
Thank you for your reply. I live in Germany so I will not order from US.
So, not everthing is so easily available. But I will try to get something similar.
Best Regards,
Burki.
Yep, there are many ways to do it, it depends on what you can get at a reasonable price, how long it will take to get there, and what you want to accomplish.
The double row of male pins will work providing you are either willing to solder the audio shield permanently to the Teensy, or if you solder female headers on the underside on the Audio Shield. It does require that your Teensy not have the pins already soldered in (or that you are willing to unsolder the pins).
One thing you can do with the double row of pins is adjust the plastic headers up/down, to get the right spacing. Then you can have the outside 28 pins have enough of the male pin below the board so that it can be used in a breadboard or in a prototype board with female headers.
If you have the pins soldered in on the Teensy, the best way is to mount the audio shield underneath the Teensy. If you aren't connecting too much else, you could use normal female headers, and just solder a few wires to the pins. But that tends to be an area where it is easy to create accidental solder bridges and shorts. Also, it has been my experience if the Teensy is mounted in a prop that moves, eventually wires soldered to pins will come off and have to be re-soldered.
I tend to prefer having the Teensy and Audio Shields be removable, since I tend to work on a project for awhile, and move on to the next. A lot of times, what I do is solder up a prototype board with female headers, and then do all of the connections on the board. That way, I can just take the Teensy out of the board and move it to the next one. That's why I prefer using stacking headers.
However, there is one place I don't like the stacking headers, and that is when I'm soldering one of the Teensy 3.2/3.5/3.6/4.0 breakout boards to access the bottom pins. I find it much harder to solder, so I tend to just use male pins on the Teensy that I can solder on the top of the Teensy, and on the bottom of the breakout card. One of the things I'm looking forward to the Teensy 4.1 is not having to mess with breakout boards.
What I do is if possible have a set of stacking headers, normal female headers, normal male headers, and longer male headers. Then I can spend time figuring out which configuration I want before getting to the soldering. I sometimes need to remind myself that at some stage it doesn't matter as much getting it perfectly correct, and just solder up something and move on.
As an example, here is a picture I did some time ago of the Teensy 3.1 connected to the prop shield, each one using stacking headers: