I bought two of this cables for connecting a eurorack system to an audio interface. In this cable the tip AND the ring of the minijack end are coupled together to the tip of the 1/4" jack. Since one side is TS (mono) and the other is TRS (stereo) the connection should be Tip to Tip and Sleeve to Ring+Sleeve. When using this cable on a modular synth (with mono jack sockets) a shortcut happens between tip and ground, and no audio reaches the interface end.
This tip-ring coupling wasn't specified anywhere, and (for what I've seen so far) is NOT the standard rule for mono cables, since mono jack sockets (1/8" or 1/4") will ground the ring connection.
This main issue aside, the materials seem to be of good quality.