## 2 Literature Review
### Reflections on the Evaluation Factors of AUX for Products and Services
\begin{table}
\begin{tabular}{c c c c} \hline \hline
**Researchers** & **Research Summary** & **Evaluation Factors for AUX** & **Research Categories** \\ \hline \multirow{6}{*}{[PERSON] et al. (2017) [53]} & \multirow{2}{*}{Deriving meaningful auditory attractiveness measures from UX} & \multicolumn{2}{c}{Loudness of sound} \\ \cline{3-4}  & & \multicolumn{1}{c}{Unpleasantness of hearing} \\ \cline{3-4}  & & \multicolumn{1}{c}{Unpleasantness of hearing} \\ \cline{3-4}  & & \multicolumn{1}{c}{measures from UX} & Degree of sound echoing \\ \cline{3-4}  & & \multicolumn{1}{c}{Degree of sound softness} \\ \hline \multirow{6}{*}{[PERSON] et al. (2018) [19]} & \multirow{6}{*}{Auditory interface proposal of UX scale (interpretation, meaning and enjoyment)} & How much the sound helps \\ \cline{3-4}  & & \multicolumn{1}{c}{How interesting the sound is} \\ \cline{3-4}  & & \multicolumn{1}{c}{How good the sound is} \\ \cline{3-4}  & & \multicolumn{1}{c}{How easy it is to understand the sound} \\ \cline{3-4}  & & \multicolumn{1}{c}{Relevance of sound and ideas} \\ \cline{3-4}  & & \multicolumn{1}{c}{Matching sound and meaning} \\ \cline{3-4}  & & \multicolumn{1}{c}{How difficult it is to understand the} \\ \cline{3-4}  & & \multicolumn{1}{c}{sound being varied} \\ \cline{3-4}  & & \multicolumn{1}{c}{How pleasant the sound is to listen to} \\ \cline{3-4}  & & \multicolumn{1}{c}{How boring it is to hear the sound} \\ \cline{3-4}  & & \multicolumn{1}{c}{How confusing it is to hear the sound} \\ \cline{3-4}  & & \multicolumn{1}{c}{How easy it is to understand what the} \\ \cline{3-4}  & & \multicolumn{1}{c}{sound represents} \\ \hline \multirow{6}{*}{[PERSON] et al. (2019) [54]} & \multirow{6}{*}{Acoustic measurements and noise abatement in general using ISO standard (Method B of the ISO/TS 12913-2:2018)} & \multicolumn{1}{c}{Unpleasantness of sound} \\ \cline{3-4}  & & \multicolumn{1}{c}{Deepree of harmony between} & Soundscape evaluation \\ \cline{3-4}  & & \multicolumn{1}{c}{How likely you are to stay again} \\ \cline{3-4}  & & \multicolumn{1}{c}{Delivering consistent and differentiated} & \multirow{2}{*}{Consistency between sounds within products and services} & Sound identity structural diagram \\ \cline{3-4}  & & \multicolumn{1}{c}{Ease of access to sound control} \\ \cline{3-4}  & & \multicolumn{1}{c}{The right amount of sound resolution} \\ \cline{3-4}  & & \multicolumn{1}{c}{How clear the sound is} & \multicolumn{1}{c}{AUX} \\ \cline{3-4}  & & \multicolumn{1}{c}{glasses} & How much is enough to resize the volume \\ \cline{3-4}  & & \multicolumn{1}{c}{How rich the range of the sound is} \\ \hline \multirow{6}{*}{[PERSON] et al. (2023) [57]} & \multirow{6}{*}{Interviewing an expert for designing AUX design in web or app environments} & Accessibility for those with sensory sensitivities \\ \cline{3-4}  & & \multicolumn{1}{c}{Blending the organic and digital} \\ \cline{3-4}  & & \multicolumn{1}{c}{Roeping sounds short and smooth} & AUX design guideline \\ \cline{3-4}  & & \multicolumn{1}{c}{Attracting attention without being} \\ \cline{3-4}  & & \multicolumn{1}{c}{distracting} \\ \hline \hline \end{tabular}
\end{table} 
Table 4: AUX factors identified by researchers. control' [56] and 'how easy it is to understand what the sound represents' [19], while the characteristics of auditory presence evaluation factors differ in that they aim to realize the sound of reality, such as the'spatial properties of sound' [14; 43; 44; 45],'similarity to real-world sounds' [34], and 'implementing real-world sounds' [39].