Contemporary practices of sonic interaction and soundscape-based music creation are transforming the relationships among listening to place, musical praxis, and digital technology. From the perspective of acoustic ecology, the soundscape is approached as a network of relationships among place, human activity, environmental listening, memory, and the cultural meanings of sound. Ubiquitous music ecologies extend this perspective towards an ecosystem of people, technologies, spaces, sonic resources, and creative decisions, within which music-making is constituted as a distributed and environmentally situated practice. On this basis, SoundRoutes is designed and developed as an original post-digital environment for soundscape creation and participatory engagement. SoundRoutes connects field recordings, spatially activated sound points, and collaborative listening routes through GPS geolocation, digital mapping, extended-reality practices, three-dimensional spatial audio, and facilities for creative transformation of sonic material. Through this integration, listening is organised as an embodied, mobile, socially shared, and creative practice, revealing new forms of interaction with sound, space, and place within an emerging post-digital environment.