Is there anyway to tune to channels other than naviagating with the arrows? Any device or remote that allows direct channel tunning? Or is there an Alexa skill that helps? Or, is there any other device to purchase to replace the digital adaptor?
This question was asked about seven months ago and I believe the answer to all your questions is still no. The Spectrum app is just not set up that way and the only way I know of to get direct channel tuning is to rent a Spectrum box.
Maybe someone else has found a different option but I haven't heard of it.
The Spectrum TV app does not allow for direct channel input on any device. This is similar to other live streaming apps like Youtube TV, Hulu with Live TV, or Sling.
Alexa probably wouldn't do you much good here since the Spectrum TV app is not officially supported on Fire TV devices at this time. Maybe someone has created an Alexa skill to control Roku devices but I doubt direct channel input is one of them.
Other than a Spectrum set top box, you could use a cablecard device, such as TiVo, that allows direct channel input just like the regular boxes.