Waveform on Raspberry Pi - where?

[zzz00m]

I assume a DAC is an extra bit of kit required?

I saw this posted recently: pisound http://blokas.io/

And this: Audio Injector https://www.kickstarter.com/projects/12 ... he-raspber

[Slntpsych1]

Whenever I install the newest version (8.1.2) I get the error "Failed to install file". It says an unspecified transaction error has occurred. Anybody else getting that?