1. A communications method comprising the steps of: (a) providing association data indicating for each of multiple types of presentation feature by which emotions can be expressed in audio form, a respective value of the feature concerned that is to be used to express each of plural emotions; (b) generating a text message at a sending device, the generated text message having user-set embedded emotion indicators and feature-type indications, (c) converting the text message into audio form for delivery to a target recipient, emotions indicated by the embedded emotion indicators being expressed in said audio form using presentation feature types indicated by the embedded feature-type indicators with the values used for these presentation features being determined by said association data.