Do you know about the MIT project from a few years ago?
$1 Consider editing your post to provide the following:
1. How many questions are in the survey
2. The average time it takes for blind survey takers to complete (e.g. using a screen reader, refreshable Braille display, voice-over, ...).
3. What follow-up is involved. Tell people in advance, before they take the survey, rather than waiting until the end as a sort of surprise.
4. Indicate whether you'll be compensating anyone.
I'm sighted, but I clicked through the survey on the chance I might offer some advice and help you encourage more people to take the survey.
The survey is **extraordinarily** long. At question 15 the survey is described as only 67% complete, and question 15 is effectively thirteen separate questions by itself: what sound do you associate with item 1? what sound do you associated with item 2? and so on.
Ask fewer personal questions. As a good book on survey taking suggested, considering asking far fewer questions rather than trying to get all questions answered in one go. Many of the questions appear to be asking for information available from other papers, such as those on the differences between the congenital blind and the adventitious blind, age-related differences, etc.
I entered "a" for every text field and those weren't flagged as invalid entries.
Your completion rate is likely to suffer significantly as a consequence of the length of the survey. Even if someone completes a survey of this length, their attention will flag and you may get invalid entries before they are halfway through. That could happen even if you pay them.
Given the work that's already been done on auditory icons, you can probably provide several multiple choice questions instead of asking for people to provide their own answer for dozens and dozens of questions. It seems as though you're asking the survey takers to have all of the ideas for you. I would suggest asking survey takers to choose among options rather than generate all the content.
Provide a "fill in the blank" option if someone wants to suggest something outside of the options you offer. For example:
"Which sound could represent a ramp to you?
* A tone that decreases in pitch
* A rollercoaster as it goes downhill
* ...
* Other (please fill in the empty text box) \_\_\_\_\_\_\_\_\_\_\_\_\_"
People won't select the Other option that often, which will give you far less data to work through. If you get even a few good "Other" comments from dozens or hundreds of survey takers, that's plenty.
Surveys with so many open-ended questions can be changed to in-person interviews instead. Getting feedback from a handful of interviewees will allow you to cut down significantly on the questions to ask people you won't see face to face, and are likely never to meet.
I would strongly recommend reading this short book about writing effective surveys. Spending a few hours with this book could save you days if not weeks of frustration.
$1 Also, read the thread here in r\\blind in which members express their annoyance about the number of surveys they're being bombarded with. I posted a survey myself of just 8 questions that takes a little over 7 minutes to complete on average. It garnered some survey takers, but it was understandably ignored by many. I should have done a better job explaining who I was, what my company is capable of doing, why my survey was worth taking, etc. I'm trying to make up for that.
A well-connected team member and friend who is blind promoted my survey elsewhere, which was significantly more effective than just posting on different social media outlets.
Good luck!