Do you mean imagination like imagining that 'speaking to one another' must refer to congregational singing as opposed to taking turns?
Btw, why do you allow singing at all? If he melody is to be made in the heart, why don't you just speak psalms, hymns, and spiritual songs and FORBID singing? That would seem to be the logical end of your approach.
I'm calling your approach the regulative principle. You may not call it that. But where is your New Testament justification for the idea that if something isn't specifically prescribed in church, it is forbidden. The 'go to' text for this belief is about Nadab and Abihu in the context of temple liturgy.
Why would one be allowed to go to Old Testament temple liturgy and apply a principle from it to New Testament church meetings but not allow for instrumental music, which we also see in the temple and tabernacle.
You haven't established the fact that speaking in psalms, hymns, and spiritual songs refers exclusively to congregational singing. Your quotes did not support that view. Turn taking is also 'one another.' When we admonish 'one another' we take turns. If we all do it at the same time, then no one could hear what other people are saying. We are to 'exhort one another' but if we do it all at the same time, no one could make out what anyone else is saying.
Peter called David a prophet while expounding on one of his Psalms, a song no doubt sung by David and others. I Corinthians those who call on the name of the Lord Jesus Christ to prophesy. It's possible a prophet could have sung a prophecy, as David did when he prophesied.
This isn't really my cup of tea, but I've been in meetings in the south where everyone prays at the same time, and I've heard that verse used to support the idea.
Are you quoting someone called Macknight or addressing a poster with that name? Your punctuation isn't clear if you are quoting. I'm not following this line of reasoning. Are you applying the commandments on speaking in tongues or the instructions on prophesying. Why would those instructions apply to prayer?
Since we have the Bible, I don't really care too much what this guy Hodge's opinion is on the matter. There is no Biblical reason to think that these gifts aren't still active or that the Spirit is not giving revelation to believers in the meetings. Paul prayed for believers to have the Spirit of revelation. We are commanded to covet to prophesy. Hebrews 10 commands believers not to forsake assembling, but to 'exhort.' As you noted with the command to speak to yourselves in psalms, hymns, and spiritual songs, the command there is not to listen to others exhort, but to exhort. (That doesn't mean we aren't to listen as well, but that there is a command to exhort.)
Romans 12 commands the one gifted to prophesy to prophesy, the one gifted to teach to teach, and the one gifted to exhort to exhort. Why wouldn't teaching and exhortation be used in a 'mutual' way like prophesying? There isn't a command to follow the same order, but why should we have a Protestant type service with one speaker at the front, only, and no one else gifted to teach doing the teaching? Paul taught all night once. The word for teach is the word from which we get 'dialogue' and it could have been interactive. But he didn't command any church to have just one elder speak in a meeting or just one member of the body. The early churches didn't have New Testament scripture, and it made sense if an apostle taught all night long before he left.
Since the Lord allows every one to have a psalm as long as it is done unto edifying, then it's pretty silly to argue that individuals can't do so just because the Corinthians could be seen as being selfishly individualistic.
(Btw, I don't think individualism is the issue. They could have been collectivists, some of whom considered the poor in the body to be part of the out-group rather than in-group.)
Let's face it. Don't you think that your type of church has everything right? They sing congregationally, so you think that must be right. That's what you are used to. That's what you've been taught. From the quotes you selected, it seems like you are against solos and choir music in church.
But let's really consider if your perspective is Biblical. First of all, the actual commands on what to do in church have to do with allowing people to speak in tongues and interpret and to prophesy in an orderly manner. But doesn't the religious tradition you are a part of and yourself personally have a problem with these things?
Your church has congregational singing, and you are against solos in church, right? But 'speaking to yourselves' can be done in turn or collectively. Normally, if it's a conversation, it would be done 'in turn.' You insist that the 'making melody in your hearts to the Lord' means the only musical instrument that can be allowed is the heart. But since Paul says to 'speak' the psalms, hymns, and spiritual songs, and the melody is in the heart, why don't you apply the same logic and forbid singing, and only allow the speaking of psalms?
And the idea that you can't do anything in church unless it is specifically commanded comes from Old Testament passages about temple liturgy. (I get the impression that the Presbyterians from whence your movement got the regulative principle were less strict against using the Old Testament.) So why can't we look at what the Old Testament says about musical instruments and use that as a justification for musical instruments in church?