This research addresses the issue of the memory-experience gap, the disconnect between momentary perceptions and post experience reporting as relates to HCI research methodologies and the study of immersive technology-mediated experiences in particular. The paper presents an overview of contemporary understanding of immersion and examines HCI methods that investigate participant experiences. We introduce Experience Probes, an integrated design and evaluation methodology that affords momentary reporting by blending states of reflection and immersion in a structured activity situated within the immersive experience. A pilot study is presented that examines an immersive soundscape installation and an Experience Probe enacted through participant-authored sound maps. The maps provide data for thematic analysis, and are coded for signs of self-perception and a sense of place to evaluate participants’ sensations of presence and immersion. Preliminary results are discussed in relation to the reality-virtuality continuum and suggest that the reflective act of reporting, and the experience of immersion within the soundscape installation are not mutually exclusive. This research seeks to extend HCI methods by overcoming the memory-experience gap in the evaluation of technology-mediated experiences.